5) She hasn't kissed me for 5 month.
The last time S + Ved/V2 was + time ago (QKĐ)
-> S + have/has not V-ed/V-pp for + time(HTHT)
8) I haven't had such a delicious meal before.
This is/It's the first time S + have/has + V-ed/V-pp.
= S + have/has + never/not + V-ed/V-pp before.
10) It is been in Monday since I last took a bath.
(Câu này mình không nhớ rõ cấu trúc lắm nha).
Chúc cậu học tốt hen!