1. lacing `->` to lace (how to do s.th)

2. to `->` bỏ (S + would rather + N/V(inf) + than +N/V (inf) + (O)

3. high `->` height (in + noun)

4. it `->` bỏ (S + V + too + adj/adv + (for s.one) + to do s.th)

5. more hard `->` harder (hard là tính từ nên thêm -er)

1. The little boy did't know how lacing his shoes. → to lace (how to V<infi>)

2. I would rather live on a farm than to live in a city. → x/ bỏ (would rather V than V)

3. The workers are building a new bridge which is 150 metres in high. → meter high

4.This text is too long for me to read it. → x/ bỏ

5.The course is good , but more hard than I thought. → harder