grammar prob

[lisa***]

good day!


please enlighten me in my puzzling.

which is grammatically correct? ANd what is the
grammatical rule behind it.

All I want to do is get some sleep. or
All I want to do is to get some sleep.

thank you big time!

[Casiopea]

Linking verb, "is". It joins 'to do' with 'to get'.

[1] All I want to do is to get some sleep. or

'to get' is a restatment of 'to do'. The second 'to' is redundant, so speakers often leave it out,

[2] All I want to do is get some sleep.

or they leave out 'to do',

[3] All I want is to get some sleep.

'to' of 'want to do' is part of 'want', not 'do', which is why [4] is not an option:

[4] *All I want do is get some sleep. (ungrammatical)

All the best,