81. I can...

Say what you are capable of doing.

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82. I can't...

Say that you are unable or not permitted to do something.

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83. I could...

Talk about a past ability or a possible action.

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84. I couldn't...

Say that you were unable to do something in the past.

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85. I know...

Say that you have knowledge or information about something.

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86. I don't know...

Say that you do not have knowledge or information about something.

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87. I understand...

Say that you understand an idea, explanation, or situation.

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88. I don't understand...

Say that an idea, explanation, or situation is not clear to you.

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89. I remember...

Say that you remember information or a past event.

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90. I forgot...

Say that you no longer remember something or failed to remember it.

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