can't help but
To be forced to; can only; must.
When the streets are full of melting snow, you can't help but get your shoes wet.
When a friend gave Jim a ticket to the game, he couldn't help but go.
To take what you want; take rather than ask or wail to be given.
Help yourself to another piece of pie.
John helped himself to some candy without asking.
To be helpful or useful; help sometimes or somewhat.
Mr. Smith helps out with the milking on the farm.
Tom helps out in the store after school.
To help (someone) especially in a time of need; aid; assist.
Jane is helping out Mother by minding the baby.
When John couldn't add the numbers, the teacher helped him out.
so help me
I promise; I swear; may I be punished if I lie.
I've told you the truth, so help me.
So help me, there was nothing else I could do.