Students practice forming suggestions by rearranging word blocks into complete sentences about going to the beach.

The task is to arrange the given words to form correct sentences. Let's solve each problem step by step:

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Problem 26:

Words:
- Let's
- the sand.
- play in

Solution:
Arrange the words to form a grammatically correct sentence. The word "Let's" is typically followed by a verb, and "play in the sand" makes sense as an activity.

Correct Sentence:
Let's play in the sand.

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Problem 27:

Words:
- take
- Let's
- a photo.

Solution:
The word "Let's" is followed by a verb, and "take a photo" is a common phrase.

Correct Sentence:
Let's take a photo.

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Problem 28:

Words:
- the sea.
- swim in
- Let's

Solution:
The word "Let's" is followed by a verb, and "swim in the sea" is a logical activity.

Correct Sentence:
Let's swim in the sea.

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Problem 29:

Words:
- catch
- Let's
- a fish.

Solution:
The word "Let's" is followed by a verb, and "catch a fish" is a common activity.

Correct Sentence:
Let's catch a fish.

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Problem 30:

Words:
- for shells.
- Let's
- look

Solution:
The word "Let's" is followed by a verb, and "look for shells" is a logical activity.

Correct Sentence:
Let's look for shells.

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Final Answers:

1. 26. Let's play in the sand.
2. 27. Let's take a photo.
3. 28. Let's swim in the sea.
4. 29. Let's catch a fish.
5. 30. Let's look for shells.

Boxed Final Answer:
\[
\boxed{
\text{26. Let's play in the sand.} \\
\text{27. Let's take a photo.} \\
\text{28. Let's swim in the sea.} \\
\text{29. Let's catch a fish.} \\
\text{30. Let's look for shells.}
}
\]