もしSi (para enfatizar)

と is used to express natural or habitual results, as in 春が来ると花が咲く ('When spring comes, flowers bloom.'). もし adds emphasis to conditionals and can appear before と or other conditionals like たら and ば. For example, もし雨が降ったら 'if it rains' has a more hypothetical tone than if もし were not present.

もし and たら are often used together to form conditional ('if') sentences. もし typically comes at the start of a sentence to emphasize the hypothetical nature of what follows, while たら gives the verb its conditional form. For example, もし宝くじが当たったら車を買おうと思います means 'If I win the lottery, I think I'll buy a car.'.

もし is typically used at the beginning of a sentence to emphasize that what follows is a hypothetical situation or condition, similar to the English 'if' or 'supposing that (A)'. もしも is a more emphatic version of this, and sentences with もしも almost always contain a conditional expression, as seen in the もしも～なら・もしも～でも pattern. The specific meaning is determined by the conditional, e.g. もしも～なら 'if (A)' vs. もしも～でも 'even if (A)'.

もし and たとえ are similar in that both can be used at the beginning of a sentence to emphasize a hypothetical situation or condition. The primary difference is that while もし can be followed by a wide variety of conditionals, including なら, たら, ば, and ても, たとえ is almost always followed by a ても expression, giving it the meaning of 'even if (A)' or 'even supposing that (A)'.

もし and ても both express hypothetical situations, but in different ways. もし appears before a clause to emphasize the condition, similar to 'if' or 'supposing that', while ても is attached to the verb itself. Because they fill different roles, they can be used together, e.g., もし雨が降っても 'even if it rains'. もし can also pair with other conditionals like たら or ば.

もし and ば are both used in conditional expressions, but play different roles. ば is a grammatical ending that turns verbs into 'if' statements, e.g. 食べる 'eat' becoming 食べれば 'if (you) eat'. In contrast, もし is used at the start of sentences or phrases to emphasize that a hypothetical statement follows, and therefore is often paired with ば, たら, or なら, e.g. もし食べれば 'if (you) were to eat...'.

なら and もし are both used in conditional expressions but have different roles. なら follows phrases to mean 'If it's the case that (A)', often implying the speaker believes it will happen. もし is used at the start of sentences or phrases to emphasize that a hypothetical statement follows, and is often paired with conditionals like なら, ば, or たら, e.g. もし雨なら行かない ('If it rains, I won't go.').