Spirogyra is a large genus (about 400 species) of freshwater green algae found in shallow ponds, ditches and amongst vegetation at the edges of large lakes, generally growing free-floating.It often grows in short-lived ('ephemeral') ponds that build up during wet weather, and dry up subsquently.pirogyra is a large genus (about 400 species) of freshwater green algae found in shallow ponds, ditches and amongst vegetation at the edges of large lakes, generally growing free-floating.
General Past Tense Pronunciation Rule. An additional syllable with the -ed ending is only necessary when the last sound (not the last letter) of the base form of the verb is a /t/ or /d/; for example, wanted (two syllables), decided (three syllables), needed (two syllables), or invited (three syllables).etting Started â Adding -ed. When teaching English past tense pronunciation for regular Simple Past verbs, ESL and EFL students have to first be taught to add -ed to the end of the base form of the verb.
3) The-ed verb ending sounds like [Éªd], [vizitid]. *******. This lesson teaches you the three rules that explain the differences in past tense verb â-edâ pronunciation. But donât be surprised if most Americans canât explain these rules to you! The truth is, Americans make these changes in sound without even noticing.reat question. Many short verbs that end in the [t] sound (or sometimes [d]) and have a relaxed vowel have an irregular past tense. For example, think of the past tense of the verbs: âhitâ âhurtâ âputâ âsetâ âshutâ.