Regarding 'Ils ________ pendant les vacances." you give the answer as 'auront grandi'. Reverso gives both an avoir and an etre form forr the future anterior of grandir. I assumed as this was intransiitive it would be the etre form?
Look at the following examples:
- Ils auront grandi pendant les vacances = they will have grown during the holidays
→ intransitive verb with auxiliary 'avoir'
-> when "grandir" = to grow (in size/height) -> use 'avoir' as auxiliary
- Elles se seront grandies avec des chaussures à talons = they will have made themselves taller with high heel shoes
→ intransitive verb with auxiliary 'être' / doing the action to oneself - not naturally
- Cette victoire t'a grandi = this victory has made you look worthy
→ transitive verb ('te' = direct object) with auxiliary 'avoir'
I hope this is helpful.
Bonne journée !
Thanks Celine, I understand the examples but still not why Ils auront grandi pendant les vacances has the auxiliary in avoir, rather than the usual etre for intransitive forms of some verbs.
I have edited my answer above. I hope this is helpful.
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