Given a sentence, generate a new sentence by performing small changes on the sentence. Here, make sure that the changes are semantically related and syntactically similar to the input. And the generated sentence should have high commonsense plausibility, that is to have reasonable probability of it being true.

If you want to fly in an ecosystem then you should plan a time .
If you want to hike in an ID then you should study a ticket .

A snowball is used to defend oneself against an alert .
A chain is used to store oneself against an attack .

You are likely to earn an audience in a church .

You are likely to remember an owner in a mall .