B2 First: using if and though
If and though are different.
I'll help you if you want. (if = it's a possible situation)
I'll help you though you don't want me to. (though = it's a fact. I know this)
If and even if are different.
I'll marry him if he is rich. (But not if he is poor!)
I'll marry him even if he is poor. (I'll marry him in any situation)
Though and even though are very similar. However even though is stronger - it adds emphasis.
I like dogs even though they are smelly.
I like dogs though they are smelly
As if and as though are the same. We use them to mean "is like / is similar".
He looked as though he wanted to cry.
He looked as if he wanted to cry.
Practice: part 2 (open cloze)
Choose the best word (if, though, as or even) to complete these sentences.