话题 go to a place for some time

话题 It was my first time to do

话题 This is my first time to do

话题 She has the proper qualifications to teach

话题 have/had known sb/sth (to) do ...

话题 to the best of one's ability

话题 so as for sb to do sth

话题 There is something to be said for

话题 If you should happen to see him

话题 It takes sb st to do sth

话题 involve sb to do sth有这样的用法？

话题 sb find it adj to do sth

问题 tie back是什么意思

If your hair is loose, it hangs freely round your shoulders and is not tied back.这句话中 back 是什么意思?

问题 难句理解

For retailers, who last year took in 24 percent of their revenue between Thanksgiving and Christmas, the cautious approach is coming at a crucial time这句话中的the cautious approach is coming at a crucial time如何理解？不懂

问题 副词能修饰短语吗

像非谓短语，介词短语等，非谓语短语本身短语里有副词修饰，外面能再有副词修饰吗？例如：Walking slowly across the grass，he pointed the gun at the lion and fired.在这里再加副词修饰可以吗?