Agreeing to Disagree: Simple Solutions for Teaching So Do I, Neither Do I, I Do and I Don’t

In fact, agreeing and disagreeing in English is quite easy once you know the patterns.
These types of sentences can be broken down into four different categories. Two patterns follow positive sentences. Two patterns follow negative sentences. Here is how to teach your students about agreeing and disagreeing in English.
Before giving your students the rules, give them a sheet with the following sentence pairs. Ask groups of two to three students to see if they can figure out what the rules are for agreeing and disagreeing in English.
After groups have their discussions, let each group share their ideas with the class. See if any groups were able to identify the patters for agreeing and disagreeing in these sentences. Then point out to your students that one thing each of these examples has in common is that its first sentence is a positive statement. Some of the examples show agreement with that statement. Others show disagreement with it. Whether agreeing or disagreeing with a positive statement, English speakers follow a pattern.
To agree with a positive statement, follow this pattern.
So + auxiliary/modal verb + pronoun
e.g. I like Ike. So do I.
Examples one through five show agreement with positive statements. Another option for agreeing with a positive statement is the following.
Object pronoun + too
e.g. I like Ike. Me, too.
Show your students how they could use this pattern in examples one through five, or show them one or two examples and have each group come up with the rest of them.
Examples five through ten show disagreement with a positive statement. To disagree with a positive statement, follow this pattern.
Pronoun + auxiliary/modal verb + not (or make the verb a negative contraction.)
e.g. I like Ike. I don’t.
Once your students understand these patterns, have them rewrite the examples in numbers one through five by disagreeing with the statements. Then have them rewrite examples six through ten by agreeing with the statements.
Once you have reviewed the rules for agreeing and disagreeing with positive statements with your students, give them this list of examples that use negative statements. Challenge them to come up with the rules for agreeing and disagreeing after negative statements.
Give the class time to share their ideas and whatever patterns they saw in the examples. Then review the following rules.
To agree with negative statements, follow this pattern.
Neither + auxiliary/modal verb + pronoun
e.g. I don’t like lima beans. Neither do I.
It is also grammatically correct to use nor to begin a sentence which agrees with a negative statement.
e.g. I don’t like lima beans. Nor do I.
While grammatically correct, this is more formal speech and is not often used casual spoken English. If you like, have students rewrite examples one through five using nor in place of neither.
To disagree with negative statements, follow this pattern.
Pronoun + auxiliary/modal verb in its positive form
e.g. I don’t like lima beans. I do.
Once your students understand these patterns, have them rewrite the examples in numbers one through five by disagreeing with the statements. Then have them rewrite examples six through ten by agreeing with the statements.
Once your students know the patterns, give them a chance to practice. Try one or more of the following activities.
That’s why these exercises agreeing and disagreeing will be so useful for your students. Not only will the information be useful, your students will have fun getting to know their classmates better and letting their classmates get to know them, too.