The phrase "a proper command of" is correct and usable in written English.
It can be used to describe someone's proficiency or mastery of a particular skill or subject, often in the context of language or knowledge.
Example: "To succeed in this role, you need a proper command of both written and spoken English."
Alternatives: "a strong grasp of" or "a good understanding of".
He discussed his problems with Adorno and Max Horkheimer, who convinced him he could not write about capitalism without a proper command of Marx.
An indication of the importance of language is the fact that the Russian Gypsies, without a proper command of Estonian, were able to itinerate only in areas with a predominantly Russian population.
This question is relevant because a proper command of basic skills is a necessary condition for an active and independent life, for updating and extending advanced skills and competences and for remaining competitive in the labour market, but also for being able to access administrative, financial and health services and to profit from the broad range of advantages offered by the new technologies.
During the Revolution, when he told his officers to "be easy... but not too familiar lest you subject yourself to a want of that respect, which is necessary to support a proper command," he was doing nothing out of the ordinary.
It is therefore an issue to be addressed in future studies how different kinds of vesicles have proper command of distinct tethering and/or fusion machineries.
Governor Dinwiddie was publicly supportive of Washington, but criticized him privately, noting that some of the Virginia Regiment's problems originated in a "want of proper Command".
Control of Bin Jawad had already switched three times in the past month and the town is now largely deserted.There is still no sign that the rebels have a proper chain of command.
In networked control systems, uncontrollable events may unexpectedly occur at a plant before a proper control command is applied to it due to communication delays.
We have also introduced two novel concepts of commanded anchoring, the electrically commanded surfaces (for mediating switching of the liquid crystal) and the high performance alignment layers (for facilitating the switching of the liquid crystal) realized practically by means of a proper nano-engineering of the alignment layer.
However, sources said, the report finds that Metcalf must bear overall responsibility for the attempt to bring the 24 rifles back to the United States, that Metcalf failed to follow proper procedures for returning weapons for use in "command presentations" to dignitaries and that the Navy must be faulted for not conducting a proper investigation of the matter.
So as part of our National Crime Agency, we are establishing a proper border policing command which will crack down on people smuggling.
