Learn Italian: Ti propongo questa alternativa perché hanno cancellato l'altro volo. - I propose this alternative to you because they canceled the other flight.

In Italian, perché (because) is almost always used in the middle of a sentence to introduce the cause after stating the result. If you want to put the cause at the very beginning of the sentence, you must use siccome (since/because) instead, like this: Siccome hanno cancellato l'altro volo, ti propongo questa alternativa.

Why is Ti at the very beginning of the sentence?

Ti means "to you" (an indirect object pronoun). In Italian, these pronouns usually go directly before the conjugated verb. So, instead of saying "I propose to you" like in English, Italian phrases it as "To you I propose" (Ti propongo).

What is the infinitive (dictionary form) of propongo?

It comes from proporre (to propose). It is a highly irregular verb that follows the pattern of porre (to put). This is why its "I" form is propongo rather than following the normal rules for verbs ending in "-ere".

Why does l'altro have an apostrophe instead of just using il or lo?