You wrote
Yes, I (mistake, should be: decided to continue) decided continue until December
Correct
Yes, I decided (fixed) to continue until December
Plan to go, forget to send: 'to' joins two verbs
6 mistakes
Depois de plan, hope, forget, learn e decide, o segundo verbo vem com 'to': 'plan to visit', 'hope to get', 'forgot to send'. Em português os dois verbos ficam colados ('esqueci de mandar', 'pretendo visitar'), mas em inglês o 'to' é obrigatório.
When one verb is followed by another, verbs like plan, hope, forget, learn and decide need 'to' before the second one: plan to visit, hope to get, forgot to send.
Dois verbos seguidos? Coloque 'to' entre eles: forgot TO send.
Wrong: I plan visit the museum in the morning
Right: I plan to visit the museum in the morning
Wrong: My brother forgot send them
Right: My brother forgot to send them
Wrong: I'm learning play some easy songs
Right: I'm learning to play some easy songs
Yes, I (mistake, should be: decided to continue) decided continue until December
Yes, I decided (fixed) to continue until December
Don't (mistake, should be: forget to bring) forget bring some cups
Don't forget (fixed) to bring some cups
Good, I (mistake, should be: hope to pass) hope pass it
Good, I hope (fixed) to pass it
I'm (mistake, should be: learning to play) learning play some easy songs
I'm learning (fixed) to play some easy songs
My brother (mistake, should be: forgot to send) forgot send them
My brother forgot (fixed) to send them
I (mistake, should be: plan to visit) plan visit the museum in the morning
I plan (fixed) to visit the museum in the morning