Bonjour
1- The imperative tense is mainly used to give orders, (<em>make a request, give advices, express something you want as a desire, recommend something ...all kinds of commands ...)</em>
2- "tu" form = 2nd person singular : informal "you" <em>(for a friend, s.o. you know well)</em>
3- "vous" form = 2nd person plural <em>(several persons)</em> <em>OR </em>formal you <em>('vous de politesse' for s.o. older, for s.o. you don't know ...)</em>
4- "nous" form = 1st person plural ==> "let's"
5- verbs in -er = -e / -ons / -ez <em>(</em><u><em>1er groupe</em></u><em> = speak : parler : parl</em><u><em>e</em></u><em> / parl</em><u><em>ons</em></u><em> / parl</em><u><em>ez</em></u><em> // sing : chanter : chant</em><u><em>e</em></u><em> / chant</em><u><em>ons</em></u><em> / chant</em><u><em>ez </em></u><em> .....)</em>
aller = va /allons / allez <em>(</em><u><em>irregular verb</em></u><em>)</em>
verbs in -ir = -e / -ons / -ez <em>(ouvrir = </em><u><em>3 ème goupe </em></u><em>-----> ouvr</em><u><em>e</em></u><em> / ouvr</em><u><em>ons</em></u><em> / ouvr</em><u><em>ez</em></u><em>)</em>
so, as you can see, verbs in -ir as 'ouvrir' <em>(3 ème goupe) </em>and those in -er <em>( 1er groupe as 'chanter')</em> have the same endings
'aller' is an irregular verb.
<em> [But the verbs in -ir = -is / -issons / -issez </em> <em>(finir = </em><u><em>2 ème groupe</em></u><em> ------------>finis / finissons / finissez) are diffferent]</em>
6- <u>"avoir"</u>
aie / ayons / ayez
<u> </u><u>"être"</u>
sois / soyons /soyez
7- Translate
a- <em>(to a child) </em>Brush your teeth ! = Brosse-toi les dents !
b- <em>(to a group of people) </em>Listen to the teacher ! = Écoutez le professeur !
c- <em>(to a group including yourself) </em>Let's go to the movies ! = Allons au cinéma !
d- <em>(to a child) </em>Do your homework ! = Fais tes devoirs !
e- <em>(to a group of people) </em>Don't take the medicine ! = Ne prenez pas le(s) médicament(s) !
f- <em>(to a group including yourself) </em>Let's not suffer ! = Ne souffrons pas !
hope this helps ☺☺☺