Accept-except

I accept your invitation.

Scientists have accepted the new theory.

preposition, conjunction.

Everyone except me.

They didn't open their mouths except to complain.

An admission fee is charged, but children are excepted.

both-neither-either.

Neither racket is expensive.

We can buy either racket.

both ... and

neither...nor

either...or

Both Nadal and Federer were late.

I was both tired and hungry when I got home. 

Neither Nadal nor Federer were late.

I was neither tired nor hungry when I got home. 

Either Nadal or Federer was late, I don't know. 

He was either tired or hungry, hence his anger.

Do you want to drink the Carlsberg or Heineken?

altogether

all together

There were altogether twenty people at the dinner.

marry, get married, be married.

I'm married.

Participle.

I've been married for five years.

How many novels did Yaşar Kemal write?

How many novels has Orhan Pamuk written?

conscience-conscious

She was conscious of the stranger standing close to her.

Self-conscious.

affect-effect

Inflation affects the buying power of the lira. 

He affected a British accent.

Not to be confused with!

slow-slower

fun,right, wrong, real

Just.  

This is just the start (that) Nadal has sought.

Reduction, Reduced Relative Clauses.

This is just the start that Nadal has sought.

by a small margin; barely:  He just got there in time. 

exactly; precisely: that's just what I mean.  

Should

You look tired. You should go to bed.

She has been studying hard, she should pass her exam.