Another class of exceptions is verbs with the conditional endings "-by, -bym, -byśmy" etc. Those endings are not counted in determining the position of the stress: "zrobiłbym" ('I would do') is stressed on the first syllable and "zrobilibyśmy" ('we would do') on the second. According to prescriptive grammars, the same applies to the first and second person plural past tense endings "-śmy, -ście" although this rule is often ignored in colloquial speech (so "zrobiliśmy" 'we did' is said to be correctly stressed on the second syllable, although in practice it is commonly stressed on the third as "zrobiliśmy"). The irregular stress patterns are explained by the fact that these endings are detachable clitics rather than true verbal inflections: for example, instead of "kogo zobaczyliście?" ('whom did you see?') it is possible to say "kogoście zobaczyli?" – here "kogo" retains its usual stress (first syllable) in spite of the attachment of the clitic. Reanalysis of the endings as inflections when attached to verbs causes the different colloquial stress patterns.