Who sings in the Simple Plan songs such as?

I'm just a kid
Time to say goodbye
The end
Thank you

And others. It sounds like I'd Do Anything with mark hoppus but I thought he Only did one song
Update: Are you sure its Pierre? He sounds so different in I Can Wait Forever. Or is THAT not him? And I thought Pierre was more muscular, in the music videos the one singing is really skinny.
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