Conditionals in Lithuanian grammar are used to express hypothetical situations or future actions whose occurrence depends on a certain condition. There are four main types of conditionals in Lithuanian: the zero conditional, first conditional, second conditional, and mixed conditional.

The zero conditional, also known as the present simple conditional, is used to express general truths or facts. It is formed by using the present tense in both the condition and the result clauses, connected by the conjunction “jei” (if).

The first conditional, also known as the future simple conditional, is used to talk about real or possible future actions. It is formed by using the present tense in the condition clause and the future tense in the result clause.

The second conditional, also known as the present unreal conditional, is used to talk about hypothetical or unreal situations in the present or future. It is formed by using the past tense in the condition clause and the present tense in the result clause.

The mixed conditional is used to talk about hypothetical or unreal situations in the past with present consequences. It is formed by using the past tense in the condition clause and the future tense in the result clause.

Overall, the study of conditionals in Lithuanian grammar is essential for understanding and expressing various hypothetical situations and future actions.