Нужно.заранее use the correct tense form. 1) my bicycle isn't here.somebody (take) it. 2) last night i (arrive) home at half past twelve. 3) david (think) of his plans again and again. 4) i remembered that i (give) simon my pen. 5) they (write) a letter by 5 o'clock. 6) he told me he often (think) of it.

1) My bicycle isn't here. Somebody has taken it.
2) Last night I arrived home at half past twelve.
3) David thinks of his plans again and again.
4) I remembered that I had given Simon my pen.
5) They will have written a letter by 5 o'clock.
6) He told me he often thought of it.