Explanation
Express a hypothetical situation; 'if', 'suppose', 'assuming'.
Formation
Verb-casual + としたら, い-Adjective + としたら, な-Adjective + だとしたら, Noun + だとしたら
Detailed explanation
The ～としたら grammar point is used to express a hypothetical situation or assumption. It can be translated as 'if', 'suppose', or 'assuming' in English. The formation differs depending on whether it is used with a verb, い-adjective, な-adjective, or noun.
Examples
Ashita ame ga furu to shitara, kasa wo motte ikimashou.
If it rains tomorrow, let's bring an umbrella.
Kono keeki ga oishikunai to shitara, daremo tabenai deshou.
If this cake is not delicious, nobody will eat it.
Kare ga byouki da to shitara, sugu ni byouin ni ikasete agete kudasai.
If he is sick, please take him to the hospital right away.
Kanojo ga gakusei da to shitara, kono resutoran wa waribiki ga aru deshou.
If she is a student, there will be a discount at this restaurant.
Practice
Grammar content sourced from hanabira.org.