4.Semi-modals
a)Present / future reference

HAVE TO
If you have to be kidnapped for ransom, wealthy Italians will tell you, it's better to fall into the hands of the Sards. "She's the one that has to be paid at once."

BE SUPPOSED TO
The injection was supposed to be diffused by a major muscle mass. "I want to know how she's listening into private conversations when she's supposed to be banned from the grounds!" said Hermione angrily.

BE LIKELY TO
However, they enjoyed themselves trying to make Hagrid tell them what the tasks in the tournament were going to be, speculating which of the entrants were likely to be selected as champions, and wondering whether Fred and George were beardless yet.

BE GOING TO
His dinner's going to be ruined if he doesn't come home soon. "Harry, this isn't going to be kept quiet," said Hermione, very seriously.

b)Past reference

HAVE TO
The great sleek swine, when faced with Haitian conditions, died as soon as possible and had to be replaced again and again from Mason's stock until the Haitians replaced their own pigs with hardy little rooters from the Dominican Republic. Call-ins from individual liquor stores using the telephone number on the bulletin had to be entered by hand. Then I had to be concealed. I had to be controlled.

BE SUPPOSED TO
The injection was supposed to be diffused by a major muscle mass.

BE GOING TO
He had heard Voldemort accusing Wormtail of making a blunder...but the owl had brought good news, the blunder had been repaired, somebody was dead...so Wormtail was not going to be fed to the snake...he, Harry, was going to be fed to it instead... "The way he talks," Harry muttered as he hobbled out of the Defense Against the Dark Arts class an hour later (Moody had insisted on putting Harry through his paces four times in a row, until Harry could throw off the curse entirely), "you'd think we were all going to be attacked any second." He was going to be armed with his wand -- which, just now, felt like nothing more than a narrow strip of wood -- against a fifty-foot-high, scaly, spike-ridden, fire-breathing dragon. Harry had no sooner torn off Sirius's reply than it took flight, clearly afraid it was going to be sent outside again.