1.my sister is very lovely.

1.否定句：my sister isn't very lovely.
一般疑问句：Is my sister very lovely?
对my sister提问：Who is very lovely?
对my提问:Whose sister is very lovely?
2.否定句：he didn't go to Italy last month.
一般疑问句：Did he go to Italy last month?
对last month提问:When did he go to
Italy last month?
对Italy提问:Where did he go last mouth?
3.否定句：.the thieves won't steal the diamond this evening.
一般疑问句：Will the thieves steal the diamond this evening?
对steal the diamond 提问:What will the thieves do this evening?
对this evening提问:When will the thieves steal the diamond?
就这样了.
改否定句只需在助动词后加 not
改一般疑问句只需把助动词提前.