I have questions please help me..
Rewrite the sentences with if clauses type1 or type2.

*The film isn't good.I won't watch it.

*The weather may be good on Sunday.We may go for a picnic.

1) Type1: "If the film isn't good, I won't watch it."
1) Type2: "If the film wasn't good, I wouldn't watch it."

2) Type1: "If the weather may be ("is") good on Sunday, we may go for a picnic."
or: "..., we will go for a picnic."
2) Type2: "If the weather might be ("was") good on Sunday, we might go for a picnic."
or: "..., we would go for a picnic."
Students: Are you brave enough to let our tutors analyse your pronunciation?
Thanks very much but only one type must be true,I mean only type1 or type2 true,not both of them.Can you understand me?Pls answer again..thanx

Both are correct.

Type 1 is called an indicative mood, and type 2 a subjunctive mood.

The type 1 sentence implies that the action in the “if” clause is quite probable.
In the type 2 sentence, the past tense in the “if” clause is not a true past but a subjunctive, and the supposition is contrary to the fact.

For the purpose of comparison between the two types of sentences, your first sentence could also be written as follows.

type 1: If the film isn’t good, I won’t watch it.

type 2: If the film were good, I would watch it.
(= Because the film is not good, I won’t watch it.)

Thus, you might write the next sentence in the same manner.

type 1: If the weather is good on Sunday, we may go for a picnic.
(It is very probable that the weather on Sunday may be good.)

type 2: If the weather wouldn’t be good on Sunday, we shouldn’t go for a picnic. (By all probability, the weather may be good.)

These are structured strictly to the grammatical patterns.
Therefore, the ones Pemmican suggested may have more flexibility in normal use.

But both type 1 and type 2 are acceptable and correct English.