---
title: Why do many migrating birds come back north in spring? — Migration and hibernation · tree and pragmatics
description: Why do many migrating birds come back north in spring? Test 9 · ★ of lesson 28 «Migration and hibernation» of the world course of Mova's primary school, with the dependency tree and pragmatics of the question and of each option; Mova's choice was wrong.
---

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# Test 9 · ★ · Migration and hibernation

<!-- .ven lang=en -->
Why do many migrating birds come back north in spring?

<!-- .vintro -->
**Mova's choice:** option 1 · **The right answer:** option 4 · wrong ✗ · **Who acts:** many migrating birds · **What happens:** migrate, come back

<!-- .vabout -->
This is test 9 · ★ of lesson 28 «Migration and hibernation» of the world course of Mova's primary school. The page gives the question's syntax tree — a dependency tree in the style of Universal Dependencies — and its pragmatics clause by clause, then the 4 options as the student saw them, each with its tree and pragmatics. Every text is parsed by Mova itself. How the student answered it, with the score of every option and why: [the test at school](https://md.mova.elamur.ai/free/en/school-run/world/28-migration-and-hibernation/#t9).

## The question {#question}

```conllu
# sent_id = question:world:28-migration-and-hibernation:t9:1
# text = Why do many migrating birds come back north in spring?
1	Why	why	ADV	WRB	PronType=Int	6	advmod	_	_
2	do	do	AUX	VBP	Mood=Ind|Number=Plur|Person=3|Tense=Pres|VerbForm=Fin	6	aux	_	_
3	many	many	ADJ	JJ	Degree=Pos	5	amod	_	_
4	migrating	migrate	VERB	VBG	VerbForm=Ger	5	amod	_	_
5	birds	bird	NOUN	NNS	Number=Plur	6	nsubj	_	_
6	come	come	VERB	VBP	Mood=Ind|Number=Sing|Person=1|Tense=Pres|VerbForm=Fin	0	root	_	_
7	back	back	ADV	RB	_	8	advmod	_	_
8	north	north	ADV	RB	_	6	advmod	_	_
9	in	in	ADP	IN	_	10	case	_	_
10	spring	spring	NOUN	NN	Number=Sing	6	obl	_	SpaceAfter=No
11	?	?	PUNCT	.	_	6	punct	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **migrate** | gerund |  |  |  |  |  |  | tree rules |
| 2 | **come back** | present · do-support | many migrating birds |  |  |  | spring | north *property* | vn escape-51.1-1 «NP V»: agent=Theme |

<!-- .note -->
One row per clause the reader finds. «not said here»: a role filled from the clause above. «roles by»: a VerbNet class and frame when one fits the verb, else the reader's rules on the tree.

## The options {#options}

### Option 1 · ← Mova's choice {#o1}

<!-- .ven lang=en -->
The south becomes covered in snow

```conllu
# sent_id = question:world:28-migration-and-hibernation:t9:o1:1
# text = The south becomes covered in snow
1	The	the	DET	DT	Definite=Def|PronType=Art	2	det	_	_
2	south	south	NOUN	NN	Number=Sing	4	nsubj:pass	_	_
3	becomes	become	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	4	aux:pass	_	_
4	covered	cover	VERB	VBN	Tense=Past|VerbForm=Part|Voice=Pass	0	root	_	_
5	in	in	ADP	IN	_	6	case	_	_
6	snow	snow	NOUN	NN	Number=Sing	4	obl	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **cover** | present · passive |  | the south |  |  |  | in snow | vn fill-9.8-1 «NP V NP PP.theme»: subject=Destination in snow=Theme |

### Option 2 {#o2}

<!-- .ven lang=en -->
They are blown back by winter winds

```conllu
# sent_id = question:world:28-migration-and-hibernation:t9:o2:1
# text = They are blown back by winter winds
1	They	they	PRON	PRP	Case=Nom|Number=Plur|Person=3|PronType=Prs	3	nsubj	_	_
2	are	be	AUX	VBP	Mood=Ind|Number=Plur|Person=3|Tense=Pres|VerbForm=Fin	3	aux:pass	_	_
3	blown	blow	VERB	VBN	Tense=Past|VerbForm=Part|Voice=Pass	0	root	_	_
4	back	back	ADV	RB	_	3	advmod	_	_
5	by	by	ADP	IN	_	7	case	_	_
6	winter	winter	NOUN	NN	Number=Sing	7	compound	_	_
7	winds	wind	NOUN	NNS	Number=Plur	3	obl	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **blow back** | present · passive | winter winds | They |  |  |  |  | vn split-23.2 «NP V NP apart»: agent=Agent subject=Patient |

### Option 3 {#o3}

<!-- .ven lang=en -->
They need to hibernate in the north

```conllu
# sent_id = question:world:28-migration-and-hibernation:t9:o3:1
# text = They need to hibernate in the north
1	They	they	PRON	PRP	Case=Nom|Number=Plur|Person=3|PronType=Prs	2	nsubj	_	_
2	need	need	VERB	VBP	Mood=Ind|Number=Plur|Person=3|Tense=Pres|VerbForm=Fin	0	root	_	_
3	to	to	PART	TO	_	4	mark	_	_
4	hibernate	hibernate	VERB	VB	VerbForm=Inf	2	xcomp	_	_
5	in	in	ADP	IN	_	7	case	_	_
6	the	the	DET	DT	Definite=Def|PronType=Art	7	det	_	_
7	north	north	NOUN	NN	Number=Sing	4	obl	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **need** | present | They |  |  |  |  |  | vn want-32.1-1-1 «NP V NP S\_INF»: agent=Pivot clause=Theme |
| 2 | **hibernate** *not said to happen* | to-infinitive | They *not said here* |  |  | the north |  |  | vn fit-54.3 «NP V NP PP.location»: agent=Agent in north=Location |

### Option 4 · ✓ the right answer {#o4}

<!-- .ven lang=en -->
There is plenty of food for raising young

```conllu
# sent_id = question:world:28-migration-and-hibernation:t9:o4:1
# text = There is plenty of food for raising young
1	There	there	PRON	EX	PronType=Dem	2	expl	_	_
2	is	be	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	0	root	_	_
3	plenty	plenty	NOUN	NN	Number=Sing	2	nsubj	_	_
4	of	of	ADP	IN	_	5	case	_	_
5	food	food	NOUN	NN	Number=Sing	3	nmod	_	_
6	for	for	SCONJ	IN	_	7	mark	_	_
7	raising	raise	VERB	VBG	VerbForm=Ger	3	acl	_	_
8	young	young	ADJ	JJ	Degree=Pos	7	xcomp	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **be** | present | plenty of food |  |  | there |  |  | vn exist-47.1 «NP V»: agent=Theme |
| 2 | **raise** | gerund | plenty of food *not said here* |  |  |  |  | young *property* | vn put\_direction-9.4 «NP V NP»: agent=Agent |

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**Text:** the tests of Mova's primary school, written for Mova (`world/data/school/`), as the course runner gave them to the student. **Trees:** Mova's own parse — the `en` model on the CPU, when the site is built — not checked by a teacher; they may be wrong. **Frames:** Mova's frames reader (`prag`), each text read on its own. Elamur Cosmic License.

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- ← previous: [Migration and hibernation, test 8](https://md.mova.elamur.ai/free/en/corpora/questions/world/28-migration-and-hibernation/t8/)
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