A,'you were right, he didn't do such thing.'
B,' he will never do anything that go against his conscience.'
'he would never do anything that go against his conscience.'

Both answers are grammaticlly right?
A,'Do you really want to help him?'
B,'I always try to help anybody who is in trouble.'
'I will always try to help anybody who is in trouble.'
'I would always try to help anybody who was in trouble.'

All answers mean exactly the same?
Please.