1) I find neither 'gain' nor 'achieve' a good choice. Use 'receive'. diotima 2) Is it fine "the CELTA and CELT-YL certificates" or should it be "the CELTA and CELT-YL 's certificates" as in "Master's degree"?
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diotima2) Is it fine "the CELTA and CELT-YL certificates" or should it be "the CELTA and CELT-YL 's certificates" as in "Master's degree"?Yes, it is fine in the original. Don't change it!
diotima"In 2009 and 2013, after I gained the CELTA and CELT-YL certificates, I was..."The construction of this is a little odd. You seem to be considering 2009 and 2013 as one time. If you gave us a complet