Many Western European languages use the same alphabet as English, with one significant difference. There can be diacritics (or accents) above certain characters.
For a student of a foreign language, it’s important to place those accents correctly. Sometimes these tiny small markers can be forgotten, for example when conjugating a verb. If the accents are forgotten, the verb conjugation may even fail.
To check that the accents are placed correctly, have a look at the reverse conjugator. There you can write the infinitive without accents and the reverse conjugator tells, whether accents should be added or not.
Check for instance the Spanish verb ‘reir’. (Note! I misspelled it on purpose)