"must check that" is correct and usable in written English.
You can use it to express an obligation to verify something. For example: "I must check that the numbers in this report are correct before submitting it."
Again, to prove convergence, one must check that is continuously differentiable in an open neighborhood of a fixed point p and that.
In the case of an autotetraploid without double reduction, we must check that multiple coalescent events between lineages within a single individual are negligible in the limit N → ∞.
You must check that is it safe to use and actually legal to use it in the area you want to install it.
He must check that the heat is working.
Most importantly tenants must check that the deposit is protected in a government approved scheme".
To find an acceptable server, the session manager must check that one or both of these session vectors are dominated by the server's version vector.
If anything must be checked that has value beyond the $2,500 -- wedding outfits come to mind -- the airline will sell insurance for the added value.
If you want to research the patent situation in a certain sector, you must check the patents that have been registered in all European countries.
Ms. Ludwig, the supervisor of counseling and student services, explains to the parent who answers the door that the district must check to see that the child lives there most of the time.
All stations must check for faulty decisions that follow different branches in state-based schedules.
In a third step, we must check if the reservations that have just been made for flow f2 respect its required delay.
