The structure 凡是…都… conveys the meaning: every person, every object and every phenomenon, all without exception.
凡是 is placed at the beginning of a sentence. 凡是 is usually followed by either a noun or a noun phrase.
In rare cases, 凡是 can be followed by either a verb phrase or an adjective.
Pay attention
凡是 cannot be followed by a pronoun.
都 is usually followed by either a verb or a verb phrase.
Scheme
凡(是)
subject
都
predicate
Pay attention
In this structure, 是 can be omitted.
Examples
凡是会员都有折扣
All members have discounts
fánshì huìyuán dōu yǒu zhékòu
凡看了这场电影的人都哭了
Everyone who watched this movie cried
fán kàn le zhè chǎng diànyǐng de rén dōu kū le
凡是可能想得到的,他们都已经做了
They did everything they could
fánshì kěnéng xiǎngdedào de, tāmen dōu yǐjīng zuò le