After: "sonra" anlamına gelen bir bağlaçtır. "After" dan sonra isim "-ing" eki almış fiil veya cümle gelir.
Examples:
I always do my homework after school.
I always do my homework after coming home from school.
I always do my homework after I come home from school.

Before: "önce" anlamına gelen bir bağlaçtır. "Before" dan sonra isim,-ing eki almış fiil veya cümle gelir.
Examples:
David washes his hands before the meal.
David washes his hands before eating the meal.
David washes his hands before he eats the meal.

Because: "çünkü" anlamına gelen bir bağlaçtır cve iki cümleyi sebeb-sonuç ilişkisi içinde birbirine bağlar.
Examples:
She has to study a lot because she has got an exam tomorrow.
Today I can't go to school because I'm ill.
We aren't going to swim because the weather is rainy.
I can't buy this bicycle because I haven't got enough money.

But. "fakat,ama" anlamına gelen bir bağlaçtır ve iki zıt anlamı veya cümleyi birbirine bağlar.
Examples:
This dress is beautiful but expensive.
This dress is beautiful,but it is expensive.
My sister lives in Germany but she can't speak German well.
We are hungry but there is nothing in the fridge.

And: "ve" anlamına gelen bir bağlaçtır ve birden fazla sözcüğü veya cümleyi bağlar.
Examples:
The weather is hot and sunny today.
Jane and Jennifer aren't at home now.
It is snowing heavily,and there is a storm.

So: "bu yüzden" anlamına gelen bir bağlaçtır ve iki farklı cümleyi sebep-sonuç ilişkisi içinde birbirine bağlar.
Examples:
I wake up so I don't go yo bed late.
Sam wants to learn English so he will go to England next summer.