1、We didn't have a school trip last sunday because it rained heavily.（同义句）
We didn't have a school trip last Sunday (because of) the heavy rain.
因为大雨,上周日我们没去春游.
2、His father gave him a mobile phone as a birthday gift.
His father (gave) a mobile phone (to) him as a birthday gift.
他父亲给了他一部手机当作生日礼物.