When we use “help do” or “help to do” something in a sentence, we are implying the same thing. While “help doing” is used to describe someone’s habit. For instance, when someone says “I helped him do his homework” another person says, “I helped him to do his homework”.

'Help someone do' is the more common and natural construction when you want to assist someone in performing an action. 'Help someone doing' is less common and may be used in specific situations where 'doing' is part of a continuous action or ongoing process.

Both 'help sb. do' and 'help sb. to do' are correct and commonly used in English. The choice between the two forms depends on personal preference or regional variations. Both forms convey the same meaning and can be used interchangeably. This phrase is correct and commonly used in English.