When did she do her homework?

We think they are very unhealthy. 

We do not have supper at eight in the evening. 

望采纳,谢谢

谢谢，不过第二个和第三个是这样的We have supper at eight in the evening(改为否定句)We _____ _______ _______ at eight in the evening.We think they are very healthy(改为否定句)We _____ think they _____ very healthy.We _____ _______ _______ at eight in the evening.We don't have supper at eight in the evening. We _____ think they _____ very healthy.We don't think they are very healthy.