「Adjectives and Adverbs」
「7: The conditional (Adj cond) and Tara (Adj tara) Forms」
For i-adjectives (including auxiliaries and the negative nai), the conditional form is obtained by adding kereba to the stem, and for na-adjectives, by adding nara(ba) or de naraba to the stem. The tara form, which is a more colloquial conditional form, is obtained by adding kattara to the stem of an i-adjective and dattara to the stem of a na-adjective.
The conditional form of an i-adjective (the ba form) is used as a conjunction to express a condition. Nara used with a na-adjective is the simplified form of naraba, which is the conditional form of the copula da. (Ba is usually optional after nara.) The main clause may express the speaker's volition, hope, suggestion or command.
Samukereba mado o shimete kudasai.
If it's cold, please close the window.
Kono hon o/ga yomitakereba kashite agemasu.
If you want to read this book, I'll lend it to you.
Ten'in ga shinsetsu nara/shinsetsu de areba, mise wa yoku hayaimasu.
If the salespeople are kind, the store becomes popular.
Hope this helps!
°˖ ✧◝(○ ヮ ○)◜✧˖ °こゆうきあいはら°˖ ✧◝(○ ヮ ○)◜✧˖ °