TO BE & ADJECTIVES for different genders
Adjectives describing Masculine nouns in Sg (Singular) take no endings (on je bogat), while the same adjectives describing Fem. Sg nouns take -a (ona je bogata), while with Sg. Neuter nouns the ending is -o (bogato selo). Plural, masc. adj. take an -i ending (ljudi su bogati), fem. adj. take -e (žene su lepe), and neuter adj. take -a (deca su visoka). In some cases, there are some changes in pronunciation, with adjectives ending in -N, or -K, for example (on je gladan - ona je gladna) - but there will be a special post on that subject.
For the sake of clarity, let's do a simple exercise with adjectives which have no pronunciation changes. The answer key is in the comment. If you want me to record the answer, just drop me a line.
A Short Adjective Story:
Andrew is tall. He is very handsome. His wife Lilly is also tall and pretty. They have a son, called Tom. He is very good. They are now at home. Their house is big, because they are rich. Their dog Ava is very old and lazy.