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.
English Grammar. The Simple Past Tense, often just called the Past Tense, is easy to use in English. If you already know how to use the Present Tense, then the Past Tense will be easy.In general, the Past Tense is used to talk about something that started and finished at a definite time in the past.nglish Grammar. The Simple Past Tense, often just called the Past Tense, is easy to use in English. If you already know how to use the Present Tense, then the Past Tense will be easy.