Defective verbs are those only certain parts of which are in use, the rest having never existed in the language or having died out of it.

One example is:

Soler. "To be accustomed to." Used in the pres. indic., Suelo, sueles, suele, solemos, soleis, suelen; in the imperf. indic., Solía, solías, etc.; and in the pres. perf., He solido, has solido, etc., as:

• En su juventud solía trabajar con ahinco--ahora ya ha aflojado un poco: When he was young he used to work with fervour, now he begins to flag a little.

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