I'm wondering: is it necessary to repeat the subject - or the verb - of a sentence in subordinate clauses introduced by words such as "but" or "like"? Are the following sentences equally correct?
a) Flight attendants share 22 things they'd love to tell passengers but can't.
b) Elizabeth Warren is the US president we need, but can’t have.
c) We thought she'd know the answer to this question, but she didn't.
d) She thinks I'm jealous, but - surprise, surprise! - I'm not.
e) Over time people started to get older, things didn't pan out like they were supposed to.
f) As much as I used to, nowadays I don't go to gigs that often.