Adverbs can describe an action or modify adjectives or other adverbs. They can be one word or a phrase.

Obligation and necessity

• We use have to to talk about all kinds of obligation. It can be used in all tenses

Vocabulary Crime

Although is a conjunction and means "aunque".

Though can be a conjunction and an adverb. As a conjunction it is interchangeable with although with the same meaning.

A phrasal verb is a phrase that consists of a verb with a preposition or adverb or both, the meaning of which is different from the meaning of its separate parts.

 Seek

There is the idea of something not material, intangible.