Which sentence is written in the conditional mood? If I don't gain enough experience, I can't be a lifeguard this summer.

Why aren't you babysitting tonight?

Since I have to mail this letter, let's stop at the post office.

I can sing well enough, so I'll join the chorus.

Have you ever contributed to “social media outrage” (using your social media accounts to boost the anger about a contemporary issue by forwarding it, liking it, etc.) without stopping to think who might’ve originated the message or what the originator’s motives might’ve been? provide example.