Say, instead: They have grown so much since the last time I saw them. You could also say: They are growing so fast. They are much bigger than when I last saw them.
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MeiQiu2months ago ... 2yearsIt seems that you changed from months to years. Also, leave a space after a number. Write 2 months, not 2months. Write 2 years, not 2years.
MeiQiuThey grown quite fast, from the last time I saw them. It was around 2yearsYou need