Present: hay
Imperfect: había
Preterite: hubo
Future: habrá
Conditional: habría
Subjunctive: haya
Past Subjunctive: hubiera
hay
habia
Esophageal (oesophageal) is an adjective and so does not have singular and plural forms.
Both forms are "was".
"Book" is a noun that has both a singular and plural form: "book" (singular) and "books" (plural).
Addendum is the singular form.The plural forms are addenda or addendums, both are accepted.
The singular form of "sheep" is also "sheep." It remains the same in both singular and plural forms.
The word singular is an adjective. Adjectives do not have singular or plural forms; adjectives have comparative forms: positive: singular comparative: more singular superlative: most singular
Typically you would remove the plural suffix (-s, -es) or change it to the singular form (-y to -ies, -ies to -y) depending on the word. For irregular plurals, there may be specific rules to follow or you may need to consult a dictionary for the singular form.
Singular. Plural is: they are, have and do.
Oropharynx is Singular Oropharynges is Plural
the haber process was invented by Fritz haber in 1908
They are all singular verb forms.
The noun memorandum is singular; the plural forms are memoranda or memorandums.
"Book" is a noun that has both a singular and plural form: "book" (singular) and "books" (plural).
"Formula" is singular; the plural forms is formulae or formulas.
Yes, most have singular and plural forms. Some also have a third form, called "dual".
The singular form is agendum. The plural forms are agenda or agendums.
"This" and "that" are singular. Their plural forms are "these" and "those."