`3.` How long is it since she began to work as a designer?
`->` When + did + S + V? = How long is it + since + S + V-ed?
`4.` We wish the city (where we are living) weren't highly polluted.
`->` Câu ước ở hiện tại: wish + S + V-ed (nếu là tobe thì luôn chia were với mọi ngôi số ít-nhiều)
`5.` I suggest his younger brother should be helped with the homework (by him).
`->` Bị động ĐTKT: should + be + Vpp + (by O)
`6.` I find it strange to use this version of software./ I am not used to using this version of software.
`->` (to) find it adj to V: thấy việc gì như thế nào
`->` be used to V-ing: quen với điều gì
