"Might" is most commonly used to express possibility. It is also often used in conditional sentences. English speakers can also use "might" to make suggestions or requests, although this is less common in American English.
Your purse might be in the living room. possibility
If I didn't have to work, I might go with you. conditional
You might visit the botanical gardens during your visit. suggestion
Might I borrow your pen? request
Using "Might" in Present, Past, and Future
Most modal verbs behave quite irregularly in the past and the future. Study the chart below to learn how "might" behaves in different contexts.
Positive Forms 1. = Present 2. = Past 3. = Future
Negative Forms 1. = Present 2. = Past 3. = Future
You can also use:
1. She might be on the bus. I think her car is having problems.
2. She might have taken the bus. I'm not sure how she got to work.
3. She might take the bus to get home. I don't think Bill will be able to give her a ride.
1. She might not be on the bus. She might be walking home.
2. She might not have taken the bus. She might have walked home.
3. She might not take the bus. She might get a ride from Bill.
might conditional of may
1. If I entered the contest, I might actually win.
2. If I had entered the contest, I might actually have won.
3. If I entered the contest tomorrow, I might actually win. Unfortunately, I can't enter it.
1. Even if I entered the contest, I might not win.
2. Even if I had entered the contest, I might not have won.
3. Even if I entered the contest tomorrow, I might not win.
1. NO PRESENT FORM
2. You might have tried the cheese cake.
3. You might try the cheesecake.
1. NO PRESENT FORM
2. PAST FORM UNCOMMON
3. You might not want to eat the cheese cake. It's very calorific.
Might I have something to drink?
Might I borrow the stapler?
Requests usually refer to the near future.
NEGATIVE FORMS UNCOMMON
REMEMBER: "Might not" vs. "Could not"
"Might not" suggests you do not know if something happens. "Could not" suggests that it is impossible for something to happen.
Jack might not have the key. Maybe he does not have the key.
Jack could not have the key. It is impossible that he has the key.