lt is fast to travel by light rail.(fast划线提问）

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lt is fast to travel by light rail.(fast划线提问）
( )( )it to travel by light rail

( how )( soon )it to travel by light rail
再问：不是说再过多久，是fast ，我感觉是说它很快。 how soon 指再过多久，主要用来对表示将来的一段时间(如in an hour, in two weeks 等)
再答：也可以提问吧
再问：总感觉不适合，谢谢你的回答，我知道了，用how is

lt is fast to travel by light rail.(fast划线提问）现要!It is fast to travel by light rail.(fast划线提问) lt's fast to travel by underground.lt's safe to travel by un ----is fast to travel by air from one place to----- He ran fast to catch the early bus.(提问划线部分） __ __run fast? Nowdays,more and more people go to work by light-rail.(划线部分N They can run fast（run fast划线）(对划线部分提问) Peter can run fast.划线提问,划线：fast His father can run very fast.划线提问very fast The teacher told us light ___ fast than sound.(travel) we know _______doesn,t travel so fast as light. By train is the safest way to travel 对划线部分提问