Conditional types

I know there exist three main types of conditionals: first type (real present or future); second type (unreal present); third type (unreal past). And talking about second type we understand it as a "dream"as well as third means "regret" about something we shouldn't have done in the past.

There are also three mixed types: condition 2 - main clause 3 (unreal, condition reffers to indefinite time, main clause - to certain past time); condition 3 - main clause 2 (unreal, condition - in the past, main part - present); condition 2 - main part 1. Doing test I was confused with one statement:

Hellen is bossy. She acts as if she owned the place.

I thought it is the right answer but still don't know is it mixed type 3 and if it is so, could you explain to me to what type reffers condition, main clause and what is its type (real/unreal) as we have two different parts. Types 2 and 3 are both unreal so there is no confusion. But in the case above.

Answer

As a side note to StoneyB's excellent answer: There are many English idioms that include the word "if". Many of these are not really conditional expressions but rather variations on other, simple phrases:

"As if" = "like" : "He looks as if he's going to run away"

"Don't mind if I do" = "I will" : "Would you like another cup of coffee?" "Don't mind if I do."

"If nothing else" = "for no other reason" : "Taking a walk every day will, if nothing else, get you away from the computer for a few hours"

"If you please" = "Please" : "Help me clear away the dishes from the table, if you please?"

And many more. Again as StoneyB mentions you could imagine a conditional in all of these, but it's not a very useful exercise. Instead it's more useful to simply recognize their underlying meaning when you see them.

Side note: You're also mixing verb tenses in your example sentence. It (normally) should be either,

She acted as if she owned the place

or

She acts as if she owns the place

However, native speakers also make this kind of mistake, so it's more about good style than perfect grammar. More information on verb consistency