前肯后否、前否后肯、時(shí)態(tài)一致、結(jié)構(gòu)一致
一般現(xiàn)在時(shí)：They aren’t students,are they
現(xiàn)在進(jìn)行時(shí)：She isn’t waiting for me,is she
現(xiàn)在完成時(shí)：Jake hasn't finished his homework,has he
現(xiàn)在完成進(jìn)行時(shí)：Denis hasn't been watching TV,has he
一般過去時(shí)：Fanny didn't go home last night,did she
過去進(jìn)行時(shí)：She wasn't sleeping at this time yesterday,was she
一般將來時(shí)：We will have wonderful summer holidays,won't we
They won't come back until midnight,will they