В чем разница между clauses of time and condition и object clauses?

conditionalsFirst conditionalIf the photos are good, I'll send them to you.If you're not going, I'm not going to go either.If I haven't come back by 9.00 ,  start dinner without me.I'll have finished in an hour if  you don't disturb me.*You can use any present tense in the if clause and any future form or an imperative in the other clause.Извини я не знаю про clauses of time