"她去吃饭去了"英语怎么说呢.

1。我想去吃饭 用 I want to have dinner 可以的2。我该吃饭了/她去吃饭了。。。It's time for my dinner/She is having dinner3。我还没有吃饭呢。英语怎么说(用一般现在时否定,还是完成时呢) I haven't had my dinner。