`1`.Mai has studied English since she was five years old

`->` Thì HTHT : S + have / has + VpII

`=>` He , She , It `+` has

`->` Since + Timeline : Từ khi nào

`2`.This house was built by the workers in `1998`

`->` BĐ `-` QKĐ : S + was / were + VpII ( by O ) ( `2 , 4` )

`=>` He , She , It `+` was

`3`.When I was young , I used to go to work by bike

`->` When + S + Ved / V2 , S + Ved / V2

`=>` Dùng để diễn tả `2` hành động đã xảy ra trong Quá khứ

`->` S + used to + V-inf : Đã từng

`4`.A lot of cakes were bought to me by my mother

`=>` You , We , They `+` were

`5`.She began to clean the room ten minutes ago

`->` S + started / began + V-ing / to V + time / timeline 

`=>` Bắt đầu làm gì

`\text{# TF}`

`1.` Mai has studied English since she was five years old

`->` Thì HTHT since thì QKĐ

`->` Form`:` S`+`has`/`have`+`$V_{ed}$`/`$V_{3}$`+`O

`2.` This house was built by the workers in 1998

`->` Câu bị động thì QKĐ

`->` S`+`was`/`were`+`$V_{ed}$`/`$V_{3}$`+`O

`3.` I used to go to work by bike when I was young

`->` used to`+`to V`:` Đã từng

`->` Được sử dụng để nói về thói quen hay hành động đã xảy ra trong quá khứ nhưng giờ không còn nữa

`4.` A lot of cakes were bought for me by my mom

`->`Câu bị động thì QKĐ

`->` S`+`was`/`were`+`$V_{ed}$`/`$V_{3}$`+`O

`5.` She began to clean the room ten minutes ago

`->` Form`:` began`+`V_ing`/`to V`:` bắt đầu làm gì

#`Darmon`