I will stop hiding.

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i am not sure about it , but i think both of them can fill into the sentence. But there is difference between them , when people say "could have done" , usually it is with regret.

Help me to correct this

D.Sanchez has been working in education since 2005 until nowadays, he has been working in different areas., kindergarten, elementary, preparatory, university and courses teaching english as a second language, he has collaborated with schools such as Discovery, upaep, among others.
He has also participated in the federal programme for SEDSOL "piso firme" around Puebla as a supervisor accomplishing several operations being an effective and economic solution to carry out formalities through this federal programme.

At the beginning of 2014 he joined Hotel Aldeas where he had contact with a different sector, tourism. After this, he decided to take advantage of his and applied the master degree in Business administration at Unid.

Finally he got an opportunity and applied to join Hoteles Club Solaris, where he became a representative of Resorts Condominiums International as vacation agent.

好---good 好的---someone ask you to do something , and you agree it , you can say 好的 好吧---you agree to do something , but a little bit reluctant . you can say好吧；or , you try to persuade someone but failed , also can say好吧 好了---when something is done,you can say 好了