Modals + simple form and perfective

Modals +Simple Form:

 

1. Can/Could

- When I was a child I couldn't walk alone, but now I can 
 (using to ability kemampuan)
- Could you do me a favor? (using to polite remark)
- It could rain tomorrow = it will possibly rain tomorrow
(using to conditional/pengandaian) 

2. May/Might

- Sir, Why may I not go home earlier now whereas yesterday I might do it? (using to permission)
- She may come late because of the traffic jam (mungkin)
- Eventhough she is a rich girl she might not have money to buy a new car because she drives an old car (mungkin) 

3. Should

- Hamid should study tonight = it is good idea if Hamid studies tonight (saran)

- Karina should go on diet = it is suggested that Karina go on diet (pendapat)

- My check should arrive next week = I hope that the check will arrive next week (harapan)

4. Must

- Dea must call his insurance today = It is necessary for Dea to call the insurance today (keharusan mutlak)

- An automobile must have gasoline to run = It is obligatory for an automobile to have gasoline to run (keharusan mutlak)

- Usman's lights are not. He must be a sleep

- The grass is wet. It must be raining (kesimpulan logis)

 Modals + perfective

1. Could + have V3/been

- He could have eaten ice cream
- She could have asked her brother to lift the box

2. Might + have V3/been

- His room was still dirty, he might have forgotten to clean it

3. Should + have V3/been

- Seta should have gone to his office this morning

4. Must + have V3/been

- The grass is wet. It must have rained last night

- Fini failed in the test. She must not have studied