1He _____（leave） when I came in .2 While he was in beijing ,he ____（call）on us every month.3I ____(not hear)from him since he lived in shanghai
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1He _____（leave） when I came in .2 While he was in beijing ,he ____（call）on us every month.3I ____(not hear)from him since he lived in shanghai
1He _____（leave） when I came in .2 While he was in beijing ,he ____（call）on us every month.
3I ____(not hear)from him since he lived in shanghai
1He _____（leave） when I came in .2 While he was in beijing ,he ____（call）on us every month.3I ____(not hear)from him since he lived in shanghai
1.was,leaving
2.called
3.haven't ,heard
1. has left
2. called
3. have't heard
1 was going to leave
2 called
3 Not having heard
1.was to(我进去时他正要离开)
2.called（乍看While he was in beijing ，好像后面用过去进行时，但是every month 表频率，又发生在过去，所以用一般过去式）
3.haven't heared（从过去的某个时间起一直到现在，用现在完成时）
1. had left
2. called
3. i have not heard( I haven't heard)
应该是这样了，恩恩~
希望能帮到你~