- If he earns $10000 a month, will he give 50% of it to his parents?
If I want to make the sentence above a subordinate clause in the construction "I'm not sure if...", should I substitute "when" for "if":
I'm not sure if ( if/when he earns $10000 a month, he will give 50% of it to his parents).
I think that the compound "if if" doesn't sound right. And is there any other options？ Thank you.