`3,` He usually wears trainers but today he is wearing formal shoes

`4,` The most famous tower in England is it

`5,` The building is new but it looks more than 100 years old

`6,` My father is right now watching a film on television

`7,` When I was talking to him yesterday, I saw his friends

~~~~~

`-` Kể lại một sự thay đổi mới đây mà không như thói quen trước đó `:` dùng thì HTTD

`-` The most adj `/` adj-est `+` noun `+` tobe `+` sth/sb 

`-` but nối 2 mệnh đề có nghĩa tương phản

`-` right now `:` dùng thì HTTD `:` đang làm gì

`-` Khi đang làm gì mà có chuyện gì xen vào `:` vế trước QKTD, về sau QKD

`3`He usually wears trainers today he is wearing formal shoes.

`=>` usually `=>` thì HTĐ

`=>` today `=>` thì HTTD

`4` It is the most famous tower in England

`=>` S+tobe+the+most+adj+...

`5`The old building is more than 100 years but it looks new

`=>` S `+` V(s/es) `+` short adj  `-` er `+` than `+`...

`6` My father is watching a film on television now

`=>` now `=>` HTTD

`7` When I was talking to him yesterday, I saw his friends

`=>` when+QKTD,QKĐ