Complex sentences with abverb clauses of time

You should wash your hands ....................... you eat.

• after

• before

• while

• as soon as

I’ll wait here .................... you come back

• as soon as

• before

• after

• until

You should turn off the lights ....................... you leave the room.

................... you plant trees in the garden, you should water them every day.

  I have to wait ..................... my mum comes home.

• until

• while

• as soon as

• when

............. she is ready, we will leave.

• before

• when

• while

• till

He usually surfs the Internet on his smartphone .................... he is waiting for the bus.

• while

• after

• before

• as soon as

................ you are in Ha Noi again, you must come and see us then.

Is the underlined part an independent clause (I.C) or dependent clause (D.C)?

( Phần gạch chân là mệnh đề độc lập (I.C) hay mệnh đề phụ thuộc (D.C) ?

He won’t speak to her until she apologise to him first.

• I.C

• D.C

Is the underlined part an independent clause (I.C) or dependent clause (D.C)?

( Phần gạch chân là mệnh đề độc lập (I.C) hay mệnh đề phụ thuộc (D.C) ?

   I will make you a cup of tea before you leave.

• I.C

• D.C