make sure the door is locked,为什么有is,make sure 不就是谓语动词了吗

I think the door is locked,but I would better go and____A.make sure to it B.be sure about C.for sure D.make sure I think the door is locked,but I'll just go and___.A.make sureB.make sure ofC.be sure toD.make sure to city,make,i,is,sure,the,safe(.) tom went upstairs again to ()the door was looked .A be sure B make sure C be sure of make sure the door is locked,为什么有is,make sure 不就是谓语动词了吗 —when you leave the office,make sure the door ---- _ok,I will A,was locked B will be lockedC should be locked D is locked 说明原因 英语选择题：Make sure ( )the door before you leave.A.to lock B.lock C.locking make sure you lock the door when you leave.翻译成中文 Make sure to lock the door ___ you go out .A.after B.when Make sure the door is shut,said he改为间接引语 did you make quite sure that you close the door?改错 --I am leaving now --__ you turn off the lights A To make sure B Make sure C Making sure please make sure youPlease make sure you _________ the door before leaving the room.A.lock B.will lock C.should lock D.must lock选什么？为什么？ I'm not sure whether I have locked the door谢啦! TEST FIVE 6.whenyou leave the room,make sure the door.TEST FIVE6.whenyou leave the room,make sure the door.A)of lockingB)you lockC)for you to lockD)to lock making sure that the door is locked before you leave the room 为毛是making 而不是make when you leave the classroom,make sure the door A is locked B will be locked 选哪个?为什么? 请帮忙分析一下句子成分：Make sure the door is never left unlocked.Make sure the door is never left unlocked.句中left 如何理解?做何成分?先谢了.