Wpisz brakujące elementy zdania we właściwym czasie.

I (already /start) my preparations.

My mother (not be) at work last weekend.

We (not explain) the problems yet.

(you/can) open the door?

(you/ever/be) injured while playing football?

My neighbors (invite) my parents to their birthday party two days ago.

John (not understand) the Present perfect tense yet.

My friends (already / arrive) .