合并下列句子1.Hedroppedacoin.Hewalkacrossthestreet(when)2.Heboiledthewather.Hedrankthewater(before)

Question

合并下列句子
1.He dropped a coin.He walk across the street(when)
2.He boiled the wather.He drank the water(before)

Answer 1

1.He dropped a coin when he walked across the street.
He dropped a coin when walking across the street.
2.He boiled the water before he drank it.
He boiled the water before drinking it.