Give the correct form of the verbs

Ex5. Give the correct form of the verbs.
1. We wish we (understand) ______________________ all the teacher’s explanation
yesterday.
2. If only I (can/ take) ______________________ the trip to Hanoi with her next summer.
3. If only I (have) ______________________ more time to do this job.
4. I wish she (come) ______________________ to see me yesterday.
5. I wish that someday I (be) ______________________ able to marry her.