Note the use of бы 'would' without a љсли-clause:
Ї бы ћчень хотљла пойтќ с тобћй.	I'd really like to go with you.
Ї хотљл бы познакћмиться с нќм.	I'd like to meet him.
Мнљ бІло бы удћбнее встрљтиться в сљмь.	It would be more convenient for me to meet at seven.
На твоём мљсте ї бы купќла ещё стџл.	If I were you I'd buy another chair.
Ї бы лџчше пошлђ в теђтр.	I'd rather go to the theater.
Conversely, you can have a љсли clause alone; use this construction to express wishes:
Љсли бы тћлько Сђша пришёл!	If only Sasha would come! If only Sasha had come!
Note the use of бы without -л- in the construction meaning If it weren't (hadn't been) for X...
Љсли бы не Сђша, у нђс нљ было бы билљтов.	If it weren't for Sasha, we wouldn't have any tickets.
Хорошћ бы ћн пришёл. (informal)	I hope he comes. (Lit., 'It would be good if he came.')
To express 'then' in an if... then... situation, you can use either тћ or тогдђ.
Љсли ћн придёт, тћ/тогдђ ї емџ скажџ.	If he comes, then I'll tell him.