Good evening, another common error committed by out clients in our Skype English classes concerns the use of the structure 'one of the'. When this is followed by a noun students have the tendency to put the noun in a singular form. Eg 'one of the pick up is a Toyota'. 'One of the' must be followed by a noun in the plural form. Thus, 'one of the pick ups is a Toyota'. A 'pick up' is a 'camioneta' in Spanish (most of our students are Spanish) in case you were wondering. http://www.clasesinglesonline.com/