Question

Present Perfect or Past Simple?
Steven(come)home yet
1)aren't coming
2)didn't come
3)hasn't come

I (see) Tim for a week
1)didn't see
2)haven't seen

Answer 1

1. Steven hasn't come home yet. (Present perfect, из-за слова YET)
2. I haven't seen Tom for a week (present perfect. со словами FOR SINCE perfect времена употребляютя)