would prefer

[lycen]

1. I would prefer you to be familiar with it.
2. I would prefer you were familiar with it.

Is the second one correct?

1. I would prefer you to help him.
2. I would prefer you help him.
3. I would prefer you helped him.

The third one sounds odd. Is it grammatically correct? I've googled it and I received only 2 search results.
Thanks.

[philo2009]

In fact all three constructions may be encountered: #3 is arguably the least common and tends to be restricted to BrE. AmE spakers will tend to prefer #2.

[konungursvia]

I don't think "I would prefer you were familiar with it" sounds very natural.

[bhaisahab]

Originally Posted by konungursvia

I don't think "I would prefer you were familiar with it" sounds very natural.

I would say this:
"I would prefer that you were familiar with it"