Conditional 2 is formed by the use of the past simple in the if clause followed by a comma would verb (base form) in the result clause. You can also put the result clause first without using a comma between the clauses. 
Conditional 3 
Often referred to as the "past" conditional because it concerns only past situations with hypothetical results. Used to express a hypothetical result to a past given situation. 
If he had known that, he would have decided differently.
Jane would have found a new job if she had stayed in Boston.
Conditional 3 is formed by the use of the past perfect in the if clause followed by a comma would have past participle in the result clause. You can also put the result clause first without using a comma between the clauses. 
Examples (if-clause at the beginning)
| type | if clause | main clause | 
| I | If I study, | I will pass the exam. | 
| II | If I studied, | I would pass the exam. | 
| III | If I had studied, | I would have passed the exam. | 
 
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now is time to practice
put the verbs in brackets and form conditional sentences type I or typeII
Example: If they learn the poem, they ________ (to get) a good mark.
Answer: If they learn the poem, they will get a good mark.
1) If you come with me, I� (to do) the shopping with you
2) Walter� (to help) his mother in the garden if she reads him a story this evening.
3) If it� (to rain), I will stay at home.
4) Our teacher will be happy if we� (to learn) the poem by heart.
5) If they had enough money, they� (to buy) a new car.
6) We� (to pass) the exam if we studied harder.
7) If Pat� (to repair) his bike, he could go on a bicycle tour with us.
8) She would get 100 pounds if she� (to sell) this old shelf.
9) If I were you, I� (to invite) Jack to the party
10) If the weather� (to be) fine, the children can walk to school
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