Possible Results:
they are smiling
-están sonriendo
See the entry for they are smiling.
are smiling
-estás sonriendo
Present progressive conjugation of smile. There are other translations for this conjugation.

they are smiling

US
SpanishDictionary.com Phonetic Alphabet (SPA)
they
 
ar
 
smay
-
lihng
International Phonetic Alphabet (IPA)
ðeɪ
 
ɑɹ
 
smaɪ
-
lɪŋ
English Alphabet (ABC)
they
 
are
 
smi
-
ling
UK
SpanishDictionary.com Phonetic Alphabet (SPA)
they
 
a
 
smay
-
lihng
International Phonetic Alphabet (IPA)
ðeɪ
 
ɑ
 
smaɪ
-
lɪŋ
English Alphabet (ABC)
they
 
are
 
smi
-
ling
Learn more about pronunciation and the English alphabet.
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