Simone
in+时间 有两成意思胡颤在多少时间内 【用于过去时态】如：He finished his homework in half an hour yesterday.在多少时间后卜做圆 【用于将来时态】如：His father will come back in an hour.for+时间 ....多少时间 【可用于各种时态】型塌如： He will stay there for a week I have learnt English for five years. Jack stayed in China for three years.
