Verbo regular: study - studied - studied
Forma simple | Forma con V-ing |
I could study you could study he could study we could study you could study they could study | I could be studying you could be studying he could be studying we could be studying you could be studying they could be studying |
Perfecto | Perfecto con V-ing |
I could have studied you could have studied he could have studied we could have studied you could have studied they could have studied | I could have been studying you could have been studying he could have been studying we could have been studying you could have been studying they could have been studying |
Forma simple | Forma con V-ing |
I couldn't study you couldn't study he couldn't study we couldn't study you couldn't study they couldn't study | I couldn't be studying you couldn't be studying he couldn't be studying we couldn't be studying you couldn't be studying they couldn't be studying |
Perfecto | Perfecto con V-ing |
I couldn't have studied you couldn't have studied he couldn't have studied we couldn't have studied you couldn't have studied they couldn't have studied | I couldn't have been studying you couldn't have been studying he couldn't have been studying we couldn't have been studying you couldn't have been studying they couldn't have been studying |
Forma simple | Forma con V-ing |
could I study? could you study? could he study? could we study? could you study? could they study? | could I be studying? could you be studying? could he be studying? could we be studying? could you be studying? could they be studying? |
Perfecto | Perfecto con V-ing |
could I have studied? could you have studied? could he have studied? could we have studied? could you have studied? could they have studied? | could I have been studying? could you have been studying? could he have been studying? could we have been studying? could you have been studying? could they have been studying? |
Forma simple | Forma con V-ing |
couldn't I study? couldn't you study? couldn't he study? couldn't we study? couldn't you study? couldn't they study? | couldn't I be studying? couldn't you be studying? couldn't he be studying? couldn't we be studying? couldn't you be studying? couldn't they be studying? |
Perfecto | Perfecto con V-ing |
couldn't I have studied? couldn't you have studied? couldn't he have studied? couldn't we have studied? couldn't you have studied? couldn't they have studied? | couldn't I have been studying? couldn't you have been studying? couldn't he have been studying? couldn't we have been studying? couldn't you have been studying? couldn't they have been studying? |