He s riding his bike, but it's starting to rain start开始(同义词) begin
start 开始（同义词）begin He’s riding his bike, but it’s starting to rain
She's doing exercises, but it,'s getting too hot get变得 too hot very hot
She’s doing exercises, but it’s getting too hot. too hot = very hot get 变得
Shes watching TV but the doorbell is ringin賂
She’s watching TV, but the doorbell is ringing