We sang English songs and do some Chinese danceslast night?为

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We sang English songs and do some Chinese danceslast night?为什么?
LOOK,your pen is on the ground .Pick up it .

第一句应该改为：
We sang English songs and did some Chinese dances last night.
因为"and"连接的前后两个分句的关系并列,所以时态应一致.
第二句应该改为：
LOOK,your pen is on the ground.Pick it up.
一般像pick up这样的短语,如果对象是一个短语,则放在介词之后（例如：Look,some pens are on the ground.Pick up the red one.)；若对象只是一个代词,例如it,him,her,me,them,us等,则把它放在动词后、介词前（例如：Look,some pens are on the ground.Pick them up.）

We sang English songs and do some Chinese danceslast night?为 We sang english songs and do some chinese dance last night. 请问这句话那里错了：We sang English songs and do some Chinese dances l ( ) We sang English songs and do some Chinese dances last ni We sang some English songs改为否定句 We sang some English songs.的否定句是什么 ——sang some english songs at party.选择：I and he or He and I 1Nancy went to school early.2.We sang some English songs.改为否 Miss Tang joined us.She sang some English songs for us.We en At the end,we sat in pairs and sang some songs.这里为什么不用in the We sang some English songs at the party.(改为一般疑问句,并做肯定,否定回答） We study Chinese,math,English and some _________subjets at s