It's not if your school doesn't allow you to. I would be speaking to somebody with authority to make decisions relating to enrolment e.g. a coordinator to discuss this as it differs from school to school. One school may allow you to do it as they have the capacity and flexibility to do so, while others might not.
A school can say no on curriculum/timetabling grounds - that's when you'd then explore other options and possibilities e.g. Distance, but I don't think you'd want to do that for a critical subject such as English.
Timetabling works in blocks - so if the subject you want to do doesn't go well with your other options, then it is definitely not possible. The timetable unfortunately takes priority over personal requests. There are so many factors at play when a decision is made like this, such as class numbers, availability of teachers, the works.... so if they say you can't do it, rest assured there's probably a really good reason why.
Perhaps you could explore doing 3/4 in another subject during Year 11, one which the school allows?