be sure to do  something
be
bi
bi
sure
ʃʊə
shue
to
do
du:
doo
something
sʌmθɪng
samthing

Definition & Meaning of "be sure to do something "in English

be sure to do something
01

used to remind someone to make sure they do something 

Examples
Be sure to turn off the lights before you leave the room. 
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