How to teach grammar?

grammar should be taught in an interesting, interactive way

Consider the following as you integrate grammar into your lessons.

•Find good lesson plans.
It's difficult to make a good grammar lesson from scratch, so any searching you do for appropriate grammar lessons in textbooks or on the Internet will be time well spent. See the Lesson Materials section of this guide for possible resources.
•Use meaningful texts.
The sentences you use to teach and practice grammar shouldn't be random. Choose material that is relevant. For example, if your learners are preparing for citizenship or need workplace English, use these contexts to create appropriate examples. If possible, bring in real-life, authentic texts to illustrate your points.
•Teach basic grammar words.
Although you need not be fluent in grammar jargon, it's a good idea to teach at least some vocabulary (noun, verb, past tense, etc.) to assist you in your explanations. Intermediate and advanced students may be familiar with many such words already.

another things to know, it is that the grammar could be teaching by Inductive and Deductive way for example:

☺ Inductive is known as a 'bottom up' approach. In other words, students discovering grammar rules while working through exercises. reading comprehension which includes a number of sentences describing what a person has done up to that period in time.

After doing the reading comprehension, the teacher could begin to ask questions such as: How long has he done this or that? Has he ever been to Paris? etc. and then follow with When did he go to Paris?

☺Deductive is known as a 'top down' approach. This is the standard teaching approach that has a teacher explaining rules to the students.

For example:

The present perfect is made up of the auxiliary verb 'have' plus the past participle. It is used to express an action which has begun in the past and continues into the present moment... etc.