Infinitives and placement

As always- context is everything.

First one doesn't make sense on its own - may do so in context..

Second and third both make sense as they are - use whichever you wish and which fits the situation.

What sort of input do you want?

evangaline said:

Any expert input on the following sentences? *shakes head* The more research I do, the more confused I become. Thanks, everyone!
The last thing he wanted was to leave.
The last thing he wanted to do was leave.
The last thing he wanted to do was to leave.

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All three work fine. This is purely a narrative style choice, up to you.

caw

I like No. 2. (ETA: but yeah, it does depend on context

No. 1 speaks to the end result. The last thing he wants is to be gone from where he is.

No. 2 speaks to the action. The last thing he'd do in this situation is actively leave.

I'm not especially fond of No.3 because I find the second "to" superfluous.)

The first really makes no sense. It's ambiguous, at best. The second probably reads best, but both it and the third are correct.

All three are fine, including the first. There's nothing grammatically wrong with any of them.