Anonymous

Simple matter of first or second conditional. If you want to, you can. If you wanted to, you could. Bonus: If you had wanted to, you could have.

Anonymous

Can

Anonymous

Firstly, you need to put the word 'be' before 'honest'. Then it would be either : If you WANT to be honest, you CAN tell him ..... or If you WANTED to be honest, you COULD tell him ......

Anonymous

match the tenses according to the conditional rules. not a question of veracity or certainty. you would be able to (you could) if you wanted. You are able to (you can) tell him if you want.

Anonymous

For correct grammar: If you want, you can. If you wanted, you could.

Anonymous

'Can' is better because you want to be honest and definite but 'would' means maybe. The word 'be' is missing in the sentence.

Anonymous

Can means one is able to do (whatever) where as could means, given the opportunity, one may be able to do (whatever). Consider this: If you want to be honest, you could say you're not going tomorrow.

Anonymous

Use "should".