I yelled for help each time my head was above water.

Far enough out that if I yelled for help, they might not hear me.

He yelled for help, but the rest of them were too far ahead.

If he yelled for help, perhaps someone would hear him.

He'd yelled for help outside, and he was coming back.

They all agree to yell for help, the time being closer to morning.

The last thing he needed was her rushing out the door and yelling for help.

He tried to speak, to yell for help, but nothing came from his throat.

Just in case we don't, though, I'm going to keep on yelling for help.

If it had been Dave, he would have yelled for help.