to write
The word 'écrire' is a commonly used verb in French, equivalent to 'to write' in English. It is used to denote the action of writing something down on a surface, typically using a pen or a pencil. It is also used for expressing the act of authoring, such as writing a letter, a book, an article, etc. Just like English, it also has an extended sense of creating non-written work, such as writing a song or a play.
I have to write a letter.
This sentence uses 'écrire' in the context of a requirement or responsibility. 'Je' means 'I', 'dois' is the present tense form of the verb 'devoir' which means 'have to' or 'must', 'écrire' is the infinitive form of 'to write', and 'une lettre' means 'a letter'.
She likes to write poems.
In this sentence, 'écrire' is used to express a preference or liking. 'Elle' means 'she', 'aime' is the present tense of 'aimer' meaning 'likes', 'écrire' is the infinitive form of 'to write', and 'des poèmes' means 'poems'. This sentence is used to show a person's hobby or pastime.
We are going to write a report.
This is a future tense sentence, using 'écrire' in a context of a future action. 'Nous' means 'we', 'allons' forms part of the near future tense construction 'going to', 'écrire' is the infinitive form of 'to write', and 'un rapport' means 'a report'. The sentence as a whole indicates that writing a report is a future plan or intention.