curriculum/challenges/english/blocks/learn-how-to-use-modal-verbs/67d803079b1a8384b2ac9aa6.md
Listen to the audio and complete the sentence below.
That's strange. Our firewall settings are usually solid. It BLANK something else.
must have been
This phrase is used to make a strong guess about the past based on evidence. Use three words.
Must have been is used to express a strong logical conclusion about the past. For example:
She is tired. She must have been working all day. - You're confident she worked all day because she looks exhausted.
Lisa is sure that the firewall settings were not the problem and believes something else caused the breach.
{
"setup": {
"background": "company2-center.png",
"characters": [
{
"character": "Lisa",
"position": {
"x": 50,
"y": 15,
"z": 1.2
},
"opacity": 0
}
],
"audio": {
"filename": "B1_14-3.mp3",
"startTime": 1,
"startTimestamp": 19,
"finishTimestamp": 24.06
}
},
"commands": [
{
"character": "Lisa",
"opacity": 1,
"startTime": 0
},
{
"character": "Lisa",
"startTime": 1,
"finishTime": 6.06,
"dialogue": {
"text": "That's strange. Our firewall settings are usually solid. It must have been something else.",
"align": "center"
}
},
{
"character": "Lisa",
"opacity": 0,
"startTime": 6.56
}
]
}