если он купит туфли без примерки, е

если он купит туфли без примерки, ему придётся обменять их, если они не подойдут ему по размеру

Результаты (английский) 1:

If he buys a pair of shoes without trying, he will have to exchange them if they don't fit him in size

Результаты (английский) 2:

if he would buy shoes without trying them on, he will have to exchange them, if they will not do it by size

Результаты (английский) 3:

If he buys shoes without show itself is, it will have to redeem them, if they do not fit your needs to him in size