INFINITIVE + SUFFIX: For example, the verb dar has a conjugation of dar+ei which is shown as darei.
STEM + SUFFIX REPLACEMENT: For example, the verb volver has a conjugation of volv+eu which is shown as volveu.
IRREGULAR: For example, the verb pedir has a conjugation of peço which is shown as peço.
The -ER conjugation is similar to the -AR conjugation with the following exceptions:
The first 'a's in the changing parts of the verbs are replaced with 'e's.
The past imperfect 'av's are replaced with 'i's.
The preterite indicative 1st person singular 'ei' is replaced with 'i' and the 3rd person singular final 'o' is replaced with an 'e'.
The present subjunctive follows the general rule in which the base of the word is determined by the present indicative 1st person singular and dropping the final 'o'. In comparison to the -ar conjugation, the final 'e's are then replaced with 'a's.
When an 'á' is replaced by an e the accent changes to an 'ê'.
The preterite indicative 1st person plural's accent is dropped.