Oil has a high combustibility.
A sentence for combustibility is If you carry cigarattes around that would be a combustibility
Blanch was our resident pyromaniac and setting fires was not only her job but her vice as well, for as she was testing various materials for their combustibility she also managed to set the ears of everyone around her aflame.
Your question is itself a sentence which uses the word "could".
Give me a sentence using the word Kerchief. That is a sentence that uses the word. Seems as though you could figure this out.
A sentence using the word Water tight could be "Is this seal watertight?" .
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An example of a sentence with are could be:"We are very happy that you could come to our party."
A Sentence using the word Gate Is: i went to open the gate so i could take my dogs for a walk .
A sentence using the word admit could be this, "The man on trial did not want to admit he was wrong."
Such a sentence could take some time to come up with.
Your spelling could use improvement.
I could not hear what you said.