我早就吃过这种菜了。

Wǒ zǎo jiù chīguò zhèzhǒng cài le.

I ate this kind of dish long ago.

他早就回家了。

Tā zǎo jiù huíjiā le.

He went home long ago.

如果你早点说，我早就帮你了。

Rúguǒ nǐ zǎodiǎn shuō, wǒ zǎo jiù bāng nǐ le.

If you had said so earlier, I would have helped you long ago.