“都dōu”means “both/all”. The people or objects included are out before “都”. For example： tā men dōu xǐ huɑn hē chá 。 他们都喜欢喝茶。 wǒ men dōu shì xué shenɡ 。 我们都是学生。 每měi……都dōu…… In a sentence that contains the term “每”(every), usually “都” has to be inserted further along in the sentence, immediately in front of the verb. tā měi tiān wǎn shɑnɡ dōu yù xí kè wén 。 他每天晚上都预习课文。 wǒ měi jié kè dōu lái 。 我每节课都来。 měi ɡè rén wǒ dōu rèn shí 。 每个人我都认识。