The phrase "a certain amount of classes" is correct and usable in written English.
It can be used when referring to a specific but unspecified number of classes in an educational context.
Example: "To complete the degree, students must take a certain amount of classes each semester."
Alternatives: "a specific number of classes" or "a certain number of classes".
Blended in with this nostalgia is a certain amount of class envy.
Nearly all Grant's seventy-two films have a certain amount of class and are well above the Hollywood average, but most of them, when you come right down to it, are not really very good.
One potential clue was our observation that, as mentioned above, 2 out of the 5 AACs for whom theta, gamma, and epsilon-related firing could be analyzed showed significant modulation of action potential discharges during running-associated epsilon waves, indicating a certain amount of intra-class heterogeneity among AACs as well.
At a party at the president's house to welcome the year's new hires, for example, one important guest approached Liskov's husband with his hand out, saying, "Welcome to MIT". Students sometimes mistook her for a secretary, and she says she went through "a certain amount of testing" in classes.
But it also takes pride in a certain amount of supposedly high-class allure, personified by Marcus Van Sciver Neil Jacksonn), a fair-haired, rich society guy with a vaguely British accent, and his bleached-blond sidekick, Chase Jessica Gowerr).
But at the same time, it requires you to spend a certain amount of time going to classes and doing homework -- and that time might be better spent elsewhere.
Sure, there are obvious brand-name buildings and tony ZIP codes where the price of entry clearly demands a certain amount of wealth, but middle-class neighborhoods do not really exist in Manhattan — probably the only place in the United States where a $5.5 million condo with a teak closet and mother-of-pearl wall tile shares a block with a public housing project.
You should send out several applications, because Catholic schools can only accept a certain amount of students into each class.
If you always have a certain amount of homework for a class every week, that would be great to add to your timetable.
