Choose the correct form of the verb in each sentence

1. At 8:30 last night when ( have) dinner my friend phone me
2. She used (go) on bari foot when she was a child
3. They suggest that you (keep) studying hard
4. She suggest (save) electricity in the class 
5. Mary (not see) me for 2 months
6. I suggest that she (speak) english with foreiginer