Here is a sample text for teaching the present perfect tense:

The Present Perfect Tense: Connecting the Past to the Present

The present perfect tense is an important grammatical structure in English that allows us to talk about actions or events that have occurred in the past, but are still relevant or connected to the present moment. Unlike the simple past tense, which focuses solely on past events, the present perfect tense creates a link between the past and the present.

For example, consider these two sentences:

1. I went to the park yesterday. (Simple Past)
2. I have gone to the park. (Present Perfect)

The first sentence simply states a past action - going to the park yesterday. The second sentence, using the present perfect tense, suggests that the action of going to the park happened at some unspecified time in the past, and the result or relevance of that action is still felt in the present.

The present perfect is formed using the helping verb "have/has" plus the past participle of the main verb. For regular verbs, the past participle is formed by adding "-ed" to the end of the verb. For irregular verbs, the past participle must be memorized.

Examples:

• I have studied English for 5 years.
• She has written three novels this decade.
• They have not seen that movie before.
• Has the train arrived yet?

By using the present perfect, we can express experiences, achievements, changes, and current relevance of past actions - all without specifying an exact time in the past when the action occurred. This makes the present perfect a versatile and important tense for communicating in English.