Write in I’ll, we'll, he'll, she'll, they'll, it’ll.

1. Jim likes walking. I think go to the park.

2. Mike is ill. I don't think go for a walk with him.

3. Rob is working so hard. I hope get a promotion.

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1. Jim likes walking. I think he'll go to the park.
In this sentence, the subject is "Jim", and the verb is "likes". The phrase "I think" indicates a future action, so we need to use "he'll" to show that Jim will go to the park.

2. Mike is ill. I don't think he'll go for a walk with him.
In this sentence, the subject is "Mike", and the verb is "is". The phrase "I don't think" indicates a future action, so we need to use "he'll" to show that Mike will not go for a walk.

3. Rob is working so hard. I hope he'll get a promotion.
In this sentence, the subject is "Rob", and the verb is "is working". The phrase "I hope" indicates a future action, so we need to use "he'll" to show that Rob will get a promotion.

Overall, the use of "I'll, we'll, he'll, she'll, they'll, it'll" depends on the subject of the sentence and the future action being described. These contractions are used to indicate the future tense and the intention or possibility of an action happening.