ZERO - IF + PRESENT ¬ PRESENT
If I feel all right, I don’t go to the doctor
FIRST - IF + PRESENT ¬ FUTURE / IMPERATIVE / CAN, MUST, ETC.
If I know anything before Tuesday, I will phone you
SECOND- IF + PAST SIMPLE ¬ CONDITIONAL SIMPLE
If I knew the answer, I wouldn’t ask you
THIRD - IF + PAST PERFECT ¬ CONDITIONAL PERFECT
If I had know all the answers, I wouldn’t have failed the exam
FILL THE GAPS WITH THE CORRECT VERB FORM:
1.- I don’t think she’s worried about us. If she (be) ............................. worried, she (phone)
........................... or something.
2.- I have an appointment at 3.30 tomorrow. If I (manage) .............................. to finish before
4.30, I (do) ................................ the shopping on my way back.
3.- Tom missed his flight. He (get) ....................................... to the airport on time if he
(not oversleep) ...................................................
4.- If I (have) ..................................... such a large house as yours, I (invite) ............................
all my friends for the weekend.
5.- If the child (not be playing) ........................................................ with matches, he (not burn)
........................................ himself. Now he’s in hospital.
6.- She’s so shy. If she (talk) ............................. to people, she (make) .......................... friends.
7.- So, you’re seeing Terry tonight. If he (ask) ................................ you about me, (not, tell)
............................... him I’m going out with John.
8.- If a machine (be) ............... properly maintained, it (fail, never) ...........................................
9.- We (invite) ............................................ him if we (know) ..................................................
his address, but he never gave it to us.
10.- Unless I (have) ....................... a problem, I (bother, never) ................................ my friends.
11.- You’re very strong. If you (try) ......................., you (win) ..........................,... your opponent.
12.- Look what you’ve done. If you (be) ......................................... careful, you (not, break)
......................................... all those glasses.
13.- I was so stupid! Nothing (happened) ........................................... if I (not, moved)
............................................... to his flat.
14.- She’s a bit short. If he (be) ...................... taller he (can) .................................. play basket.
15.- Sorry. I (lend) ................................. you the money you need if I (have) ........................ it.
16.- The bus is full up. If there (be) ..................... an empty seat, I (sit) ............................. down.
17.- Why didn’t you go to the police station? If you (report) ..................................... the theft, they
(can arrest) ............................................ the robbers.
18.- I (leave) ............................ him a message is he (not, be) ......................home when I phone.
Key