已经 and 如果
已经
已经 (yǐjing) is a common adverb meaning 'already'. It appears before the verb.
我已经给他回复了。 (I have already replied to him).
如果
如果 (rúguǒ) conjunction meaning
'if'
如果我不去不太好。 (If I don't go, it won't be good.)
如果 is used at the beginning of the sentence.
