[Grammar] For/of/do?

[Nima1000]

1.There are various ways of/for doing this.

Which preposition must we use?why?

2.a goat's beard(a goat has beard).is this corroct?

 

[emsr2d2]

1.There are various ways of/for doing this.

Which preposition must we use? Of.

Why? Because that is how we say it!

2. A goat's beard (a goat has a beard). Is this correct?
If you are trying to use the possessive to talk about a beard which belongs to a goat, then yes, but context would dictate whether it is correct or not.

See above. My amendments, and my responses, are in red.