<p>To elaborate on the answer to question 1, given in post #2, in this case “subject” is used as an adjective, not a noun. The phrase “subject to” is equivalent in this context to “dependent upon.” So you don’t make it a plural noun.</p>
<p>To elaborate on the answer to question 1, given in post #2, in this case “subject” is used as an adjective, not a noun. The phrase “subject to” is equivalent in this context to “dependent upon.” So you don’t make it a plural noun.</p>