happen有过去进行时吗?不是说它非延续动词吗?老师说可以,我觉得不可以啊. what was happening to the boy when you saw him yesterday这句话对吗?

happen有过去进行时吗?不是说它非延续动词吗?老师说可以,我觉得不可以啊. what was happening to the boy when you saw him yesterday这句话对吗? happen有过去进行时吗如题. i was being 是过去完成进行时吗那它为什么不是过去被动进行时呢 What (happen)in the Disneylang at this time yesterday?是用过去进行时吗? 过去进行时可以表过去将来吗?现在进行时不是可以表将来吗? 有一般过去现在进行时吗?... what is happening ?不是不能说 it is happening 么happen 有进行时么 为什么不能说 it is happening 却能说what is happening 四楼你先你美国朋友教教我啊···· happen to do和happen to be doing有什么区别?区别是?HAPPEN TO BE DOING加的是进行时是吗?那是不是不能加结束性动词（短暂动词）了 We____for Tom at ten last Sunday.He often kept us_____.选择:A were waiting;waiting B waited;waiting它不是过去的某一时刻吗为什么不用过去进行时?often后面可不可以加kept,它不是过去式吗? come不及物动词为何有过去分词不是说不及物动词没有过去分词吗? The mother who lost her son insisted the careless driver was to blame for the traffic accident happening yesterday.请问下happening能换成happened吗?为什么happen做非谓语动词不是可以用过去分词的吗？ What is happening on?or What happen.“怎么了?”哪一个对?happen不是没有进行时与被动语态？ love,like有没有过去试,现在进行时的用法?此类非实意动词都有吗?怎么用? 有非生物有细胞吗?肌肉有细胞，可它不是生物是不是说，有细胞的不一定是生物 have been studying过去进行?用法?have been studying是过去进行吗它意思是什么?过去进行的用法? happen可以用进行时吗?比如说..was happening? When the man --- the museun,his friends ---- him.A.visited,sawB.visited,seeingC.was visiting,was seeingD.was visiting,sawThe answer is D.when不是只能跟一般过去吗?它能跟过去进行时吗? happen 用被动式吗?happen用进行式吗?