Don't interrupt and correct your students while they are speaking. Keep silent and make notes of the errors. After the presentation congratulate and thank the students before you consider the errors. Invite students to self-correct and then elicit corrections from the rest of the class. Delayed correction does not interrupt the student's thought process.
Communication is more important than grammatical accuracy.
Concentrate on helping students to improve their communication rather than simply eliminate grammatical errors from their speech. Question 2 I've been using 'English Together' and the 'Cuckoo' videos. I notice that my students fail to speak and can hardly read. They still keep guessing the meaning of words by their initial letters. Natalia Krasnoyarsk, Russia Nick says Some of the problems your students have are common to children all over the world, others are connected with learning the Latin alphabet in addition to the Cyrillic alphabet of their mother tongue.