Regular verb: strain - strained - strained
Simple form | V-ing form |
I must strain you must strain he must strain we must strain you must strain they must strain | I must be straining you must be straining he must be straining we must be straining you must be straining they must be straining |
Perfect | V-ing perfect |
I must have strained you must have strained he must have strained we must have strained you must have strained they must have strained | I must have been straining you must have been straining he must have been straining we must have been straining you must have been straining they must have been straining |
Simple form | V-ing form |
I mustn't strain you mustn't strain he mustn't strain we mustn't strain you mustn't strain they mustn't strain | I mustn't be straining you mustn't be straining he mustn't be straining we mustn't be straining you mustn't be straining they mustn't be straining |
Perfect | V-ing perfect |
I mustn't have strained you mustn't have strained he mustn't have strained we mustn't have strained you mustn't have strained they mustn't have strained | I mustn't have been straining you mustn't have been straining he mustn't have been straining we mustn't have been straining you mustn't have been straining they mustn't have been straining |
Simple form | V-ing form |
must I strain? must you strain? must he strain? must we strain? must you strain? must they strain? | must I be straining? must you be straining? must he be straining? must we be straining? must you be straining? must they be straining? |
Perfect | V-ing perfect |
must I have strained? must you have strained? must he have strained? must we have strained? must you have strained? must they have strained? | must I have been straining? must you have been straining? must he have been straining? must we have been straining? must you have been straining? must they have been straining? |
Simple form | V-ing form |
mustn't I strain? mustn't you strain? mustn't he strain? mustn't we strain? mustn't you strain? mustn't they strain? | mustn't I be straining? mustn't you be straining? mustn't he be straining? mustn't we be straining? mustn't you be straining? mustn't they be straining? |
Perfect | V-ing perfect |
mustn't I have strained? mustn't you have strained? mustn't he have strained? mustn't we have strained? mustn't you have strained? mustn't they have strained? | mustn't I have been straining? mustn't you have been straining? mustn't he have been straining? mustn't we have been straining? mustn't you have been straining? mustn't they have been straining? |