imperativo and pronombres

Question 1

imperativo irregulars > informal
to go, to do/make, to have, to come, to put
to be, to go, to say

Answer 1

Salir > sal
Hacer > haz
Tener > ten
Venir > ven
Poner > pon 

Ser > sé
Ir > ve
Decir > di

Question 2

imperativo irregulars > formal
to go, to do/make, to have, to come, to put
to be, to go, to say

Answer 2

Salir > salga
Hacer > haga
Tener > tenga
Venir > venga
Poner > ponga 

Ser > sea
Ir > vaya
Decir > diga

Question 3

keeping the same sound:

to continue, to take, to pick up/bring, to search, to take, to utilise

Answer 3

seguir > sigue, siga
coger > coge, coja
recoger > recoge, recoja
buscar > busca, busque 
tocar > toca, toque 
utilizar > utiliza, utilice

Question 4

pronombres:

Answer 4

add lo/la/los/las
in doing so, change number of syllables therefore accent needed.
e.g Puedo coger el teléfono?
Si, cógelo.

Why?
initially coge - accent on ‘co’ as ends in N/S/vowel and has no accent.
add ‘lo’ > cógelos - stress still on ‘co’ which is now 3rd from end.