The plural of thesis is "theses." This is a common rule in English where nouns ending in -is have their plurals formed by changing the -is to -es. So, "thesis" becomes "theses."
It's important to note that when writing or speaking, you should always use the correct plural form of a word. Using an incorrect form can lead to confusion or make you seem less credible. Additionally, learning the plural forms of common nouns is an essential part of mastering English grammar.
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