过去时 He left He was a teacher I played football yesterday.He played football yesterday.They played football yesterday.She danced yesterday.didn’t play football yesterday.He didn’t play football yesterday.They didn’t play football yesterday.She didn't dance yesterday 现在时 He is a teacher That cat is mine the flowers are beautiful i have a pencil they are my friend i am a student she is my sister i have a happy family those cars are cool today is fine i like winter i love my family today is sunday tomorrow is my birthday it is a sunny day 现在进行时 I'm playing basketball with my friend now.He is helping his mom do the housework.She is gong to school .They are drinking water now .Listen!She is singing.Rod is swimming now.Ann is dancing.David is taking photos.Emma is sleeping.My mum is cooking.