这封信表明他对她的爱意。

zhè fēng xìn biǎo míng tā duì tā de ài yì.

This letter expresses his love for her.

他的态度明确地表明了他的意图。

tā de tài du míng què de biǎo míng le tā de yì tú.

His attitude clearly showed his intentions.

他的行动明确地表明他的立场。

tā de xíng dòng míng què de biǎo míng tā de lì chǎng.

His actions clearly indicate his position.