It's a good question. In connected speech, the 'p' and the 'm' of 'Help' and 'me' merge. If you say the word 'Help' on its own, you put your lips together to make the 'p' sound and then you release them with a puff of air. If you say 'Help me', you put your lips together to make the 'p' sound, but you don't release the puff of air. You go straight into the 'm' sound without parting the lips. Your lips stay pressed together to make the 'm' sound, and then they open again for the 'ee' of 'me'. Try practising it a few times. Say 'Help' on its own and feel the puff of air. Then try saying 'Help me' without releasing it - keeping the lips together and merging the 'p' sound into the 'm'. If you like, you can record your voice on vocaroo.com, and we can listen to it and tell you what we think. Good luck!

Can* you help me with something? That is pretty fluid already. You would "can" because you are asking for help in the present.