The second type of infinitive usually has the ending -da. In some cases, the suffix can be -ta or only -a (-d- has disappeared).
If the stem of the verb already ends in d or t, this consonant is normally not repeated and only -a is added to the end of the word.
1) after verbs expressing wish, intention, possibility:
|to try, attempt||proovima|
|to be able, know how||oskama|
2) after verbs that express a feeling or emotion:
|to fear, be afraid||kartma|
3) after impersonal expressions:
|it is time||on aeg|
|it is beneficial, useful||on kasulik|
|it is hard||on raske|
|it is necessary||on tarvis|
|it is necessary||on vaja|
|it is painful||on valus|
|it is possible||saab|
|it is permitted||tohib|
|one ought to, must||tuleb|
4) after the conjunction et, when it means 'in order to'
5) when the infinitive is used as the subject in a sentence, or when it modifies a subject:
The -des form is derived from the -da infinitive and it is used to indicate an action which occurs at the same time as another.
It is constructed by substituting the endings -da, -ta or -a with -des, -tes or -es respectively.
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