First Declension Forms
One of the first nouns a Latin student encounters is that for the word woman. Femina is the Latin word for woman or female and declines regularly in the first declension. Femina fully declined has the following inflected forms:
Notice that some of the inflections found at the end of the word are similar in some cases. For example, genitive singular, dative singular, and nominative plural all have the same form feminae. Similarly, both the singular forms of the nominative and ablative cases have the form femina. Lastly, the plurals for both the dative and ablative have the same form feminis.
It was mentioned above that since Latin is an inflected language, the endings of the words change to indicate their function in a sentence (i.e. subject, direct object, indirect object, etc.). Often, Latin inflections will be similar with only context and sometimes word order to help.
Unfortunately, in later declensions it gets worse with several more inflected words having the same forms. This illustrates the importance of memorizing the forms as soon as a declension is encountered. In this way, you avoid having to look back through notes and lessons to discover the potential function of a word in a sentence. By understanding that some forms are similar, it becomes immediately apparent to an attentive Latin student that the word feminae may be functioning, for example, as a singular direct object (dative case) or as a plural subject (nominative case).