Future, Mi povos = _I shall be able to_, _I can_.
Future, Ni estos povintaj = _We shall have been able to_.
Conditional, Mi povus = _I should_ (or, _would_) _be able to_, or, _I could_, or, _I might_.
Conditional, Li estus povinta = _He would have been able to_, or, _He could have_.
Examples.--_Ĉu vi povas tion fari? Jes, mi povas_ = Are you able to (can you) do that? Yes, I can. _Mi ne povas vidi la arbon, kiun vi montras_ = I cannot see the tree which you point out. _Mi povis fari tion, kion vi volis_ = I was (have been) able to do what you wished. _Mi ne povis fari tion, kion vi postulis_ = I was not (have not been) able to do (I could not do) what you required. _Mi povos tion fari morgaŭ_ = I shall be able to (I can) do that to-morrow. _Se vi povus veni mardon, mi povus vin vidi_ = If you should be able to (if you could) come on a Tuesday, I could see you. _Mi povus tion fari morgaŭ, se...._ = I could (should be able to) do that to-morrow if.... _Ĉu li estos povinta plenumi la laboraĵon, kiam vi lin vidos morgaŭ?_ = Will he have been able to complete the work when you (will) see him to-morrow? _Se vi venus hieraŭ, mi estus povinta vin vidi_ = If you had come yesterday, I could have seen you. _Li povus veni, se li volus_ = He might (would be able to) come if he wished (see pars. 237 (_l_), (_m_)).
237 (_g_). Sidi = _to sit_, _to be sitting_. Sidi has sometimes the signification "to be" in some defined place.
Examples.--_En la ĉambro sidis nur kelke da homoj_ = In the room were (sat) only a few (some) men. _La kuiristo sidas en la kuirejo_ = The cook is (sits) in the kitchen. _En la kandelingo sidis brulanta kandelo_ = In the candlestick was (sat) a burning candle.
237 (_h_). Sin trovi = _to find oneself_. This expression (or, troviĝi = _to be found_, _to find oneself_, _to be_, or, _to be situated_) is often used for the English verb "to be."
Examples.--_Sur la arbo sin trovis multe da birdoj_ = On the tree were (found themselves) many birds. _Super la tero troviĝas aero_ = Over the earth is air.
237 (_i_). In English the following and many other verbs are used in both a transitive and intransitive sense:--_to stop_, _to continue_, _to pass_, _to finish_, _to commence_. In Esperanto ĉesi, daŭri, pasi are intransitive; so, to make them transitive, we must add _IGI_. On the other hand, fini and komenci are transitive; therefore, to make them intransitive, we must add _IĜI_ (par. 280).