Some English words can change their word class ........................................................ their form. Thus, they can function as nouns (e.g. a mother) or as verbs (to mother somebody) without any affixes or inflections. Such change of a word class without any derivative means is called conversion.

Lexicology is a branch of linguistics which studies the …………………………… of a language

Lexicology is a branch of linguistics, the …………………… of language.

Phraseology is the study of set expressions called phraseological units. These "set expressions" are ..........................................................idiomatic and reproduced in speech as ready-made units.

Lexicography, the science of dictionary-compiling, is closely connected with lexicology, both dealing with the same problems — the form, meaning, usage and origin of vocabulary units — and making ...................... of each other’s achievements.

Phraseological unities are word-groups with a completely changed meaning, that is, the meaning of the unit does not correspond to the meanings of its constituent parts. They are ...................................... or, putting it another way, the meaning of the whole unit can be deduced from the meanings of the constituent parts.

Descripitive lexicology studies the words at a synchronic aspect. It is concerned with the vocabulary of a language as they exist at the …………………………….. time