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"Lo siento" is a phrase which is often translated as "I'm sorry", and "no hablo mucho inglés" is a phrase which is often translated as "I don't speak much English". Learn more about the difference between "lo siento" and "no hablo mucho inglés" below.
lo siento( 
loh
syehn
-
toh
)A phrase is a group of words commonly used together (e.g., once upon a time).
a. I'm sorry 
Me enteré del fallecimiento de tu padre. Lo siento.I heard about the death of your father. I'm sorry.
no hablo mucho inglés(   
noh
ah
-
bloh
moo
-
choh
eeng
-
glehs
)A phrase is a group of words commonly used together (e.g., once upon a time).
a. I don't speak much English 
Lo siento, pero no hablo mucho inglés. ¿Hablas tú español?I'm sorry, but I don't speak much English. Do you speak Spanish?
a. I don't get to speak English a lot 
Ahora que vivo en Francia, no hablo mucho inglés, hablo casi todo el tiempo en francés.Now that I live in France, I don't get to speak English a lot. I speak French most of the time.