Select the correct answer from the list.

Participles can be present or past participles. Present participles always end in __

1. -ing
2. -ion
3. -s or -es
4. -ed

1. -ing

and past participles end in __ unless they are irregular verbs

1. -ed
2. -ing
3. -s or -es
4. -ion

1. -ed

The correct answer is 1. -ing.

To find the correct answer, we need to understand what a present participle is and how it is formed.

A participle is a verb form that can function as an adjective. It is created from a verb by adding specific endings. A present participle is formed by adding "-ing" to the base form of a verb.

Now, let's look at the options:

1. "-ing": This ending is associated with present participles. This is because present participles are formed by adding "-ing" to the base verb. Therefore, option 1, "-ing," is the correct answer.

2. "-ion": This ending is not related to present participles. It is commonly used to form nouns from verbs, but it does not indicate a present participle.

3. "-s" or "-es": These endings are related to the simple present tense of verbs, which indicates a habitual or general action. They do not form present participles.

4. "-ed": This ending is associated with past participles, not present participles. Past participles are often used in forming the perfect tenses, passive voice, or as adjectives.

In summary, the correct answer is option 1: "-ing."