you two keep guard at the door 和you two to keep gard at the door 哪个对 为什么

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• you two keep guard at the door 和you two to keep gard at the door 哪个对 为什么
• you two keep guard at the door 和you two to keep gard at the door 哪个对 为什么
• He was ____thought and didn't hear the knock of the door.为什么是lost in,而不是losing in（进行时）?
• 非谓语动词1.he closed the door with a bang,entering the house.2.Tom rushed into the room( covering)with snow3.he ate his dinner,with chopsticks using=he used chopsticks ate dinner4.As he saw that it was rainningJohn put on his rain coat.=Seeing thait was rainningJohn put on his rain coat.t这几句对吗?仔细讲讲