变反义疑问句.Those roses look really beautiful,______?这里的look应该是系动词吧,改成反义疑问句是不是要提look?若不是,

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变反义疑问句.Those roses look really beautiful,______?这里的look应该是系动词吧,改成反义疑问句是不是要提look?若不是,
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变反义疑问句.Those roses look really beautiful,______?这里的look应该是系动词吧,改成反义疑问句是不是要提look?若不是,
变反义疑问句.
Those roses look really beautiful,______?
这里的look应该是系动词吧,改成反义疑问句是不是要提look?若不是,

变反义疑问句.Those roses look really beautiful,______?这里的look应该是系动词吧,改成反义疑问句是不是要提look?若不是,
look 在这里是系动词.但在疑问句时不能提前.在否定句中也不能在后面加not,要用助动do 或does 来帮助构成疑问句或否定句.这点是和be不一样的.所以我们也称它为半系动词.其它半系动词也一样,如:sound seem feel 等等.
所以例句中的后半部分应填为:don't they
再看其它例子:
I feel happy.Do you feel happy?Yes,I do.No,I don't.I don't feel happy.
I am happy.Are you happy?Yes,I am.No,I'm not.I am not happy.

句意:这些玫瑰看上去真的很漂亮,不是吗?
don't they
陈述部分肯定式+疑问部分否定式可记为前肯后否定

Don't they
Look是动词,疑问句和否定句要用助动词do did does
因为是一般现在是时,所以用do啦

don't they
是系动词,但不是be动词