CEDICT
if
Wiktionary
假设、倘若。《儒林外史.第三九回》:「设若这个人还不能救你,我今日说破这个话,连我的性命只好休了!」也作「设令」、「设使」。
重編國語辭典
如果,假如
維基詞典
Imagine that you have a time machine.
Imagine what it would be like if you had a time machine.
Source: Tatoeba