Have been working for several years

have been working 是什么时态 I/we should have been working.是什么意思 Have been working for several years I have been working for two days. i have been working lots as Because i have been working Because i have been working hard have been working与have worked的区别 have worked 和 have been working有什么区别 must have working hard与must have been working hard的区别 Perseveringly though they have been working for months, Have you been working here long?long是什么词性. You d____ this reward as you have been working hard. I have been working here for 7 years.改为同义句怎摸说形如I have been working here— — — I have been working hard all morning有没有什么语法错误有have been working这种说法吗 .“Perhaps she is working for John.” “Yes,she ______ for him.”A.need have been workingB.ought be workingC.may be working D.ought have been working 哪个对have she been working fou 1hour?/has she been working fou 1hour做否定回答呢 We ----on it for several hours but we have not yet reached any conclusionA.work B.are working C.have been working D.have been worked where have you been?we have been looking for you everywhere.i(worked out)a teaching plan in my office.为什么这里不填have been working out.had been working out; had been work out