for several days改成since

for several days改成since “几天”的英语是several days,还是for several days? SAT：last for several days VS last several days第二种用法可以吗?SAT里算错吗? 高手I‘ll stay there for several days I’ll saty there for ____ ____ ____ days 问题When can they finish the work ______,Just waitA.Unit next month B.Not until next FridayC.Several days ago D.For several days为什么 请将You can take a ride on the boat for several days.译成中文. _____________ I haven't seen him for several days?-He has gone to English What she said before pleased her parents for several days.中的before是什么意思? Has Jim arrived yet Yes ,he has ___there for several days .填been还是gone为什么 the young man was found alive after being missing for several days 怎么was 跟found Sometimes it can take several days for a tiger to finish eating its kill.中文翻译 the job has been advertised for several days,but so far no one have__to the advertisement [I'm tired. Disappear for several days. Don't disturb me]什么意思什么意思啊 i want am for too tired several so i to relax days连词成句 what she said before pleased her parents for several days.这句话怎么翻译?for several 为什么before后动词不用加ing,please是什么词性? 英语的语法问题：After we used it for several days.请问这句话中的for在这里的作用 Tom is ill in hospital,He__a cold for several days.A,is B,catchC,has caught D,has had. What she said before_______her parents for several days.A.pleasantB.pleasingC.pleasedD.pleasure可以顺便告诉我下为什么吗?