单句改错，

1.I think that(改为it，形式宾语，不能用that) interesting to see a film with friends.

2.This soup need(needs,主语是第三人称单数） more salt.

3.Did you discover how opening（to open用how to do不用how doing) the box?

4.When he was very young, he made on(up固定短语） his mind（make up one's mind:决定） to be an actor.

5.He has been a Parry member since（改为for接一段时间） ten years.（或在years后加ago,因为since后接时间点)

1.I think that 【添加it's】interesting to see a film with friends.
原因从句：缺主谓

2.This soup need【needs】 more salt.
单三：加s

3.Did you discover how opening【to open】 the box?
how to do 固定

4.When he was very young, he made on【up】 his mind to be an actor.
make up one‘s mind 决定的意思

5.He has been a Parry member since【for】 ten years.
for加一段时间

1. that -- > it
2. need --> needs
3. opening --> to open
4. on 改为 up
5. since --> for

1.I think (it's) interesting to see a film with friends.

2.This soup (needs) more salt.

3.Did you discover how (to open) the box?

4.When he was very young, he made （up）his mind to be an actor.

5.He has been a Parry member （for） ten years.

1.that 后加is;
2.need 改为needs;
3.how后加to;
4.on改为up;
5.since改为for.
祝你学习进步