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Licensed to the Apache Software Foundation (ASF) under one or more contributor license agreements. See the NOTICE file distributed with this work for additional information regarding copyright ownership. The ASF licenses this file to you under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.
	public List<Feature> extract(JCas jcasIdentifiedAnnotation arg1,
		List<Feature> feats = new ArrayList<>();
		//find event
		List<EventMentionevents = new ArrayList<>();
		if(arg1 instanceof EventMention){
		}else if(arg2 instanceof EventMention){
			return feats;
		//1 get covering sentence:
		Map<EventMentionCollection<Sentence>> coveringMap =
		Sentence knowSentence = null;
		String seenVbPattern = null;
		for(EventMention eventevents){
			Collection<SentencesentList = coveringMap.get(event);
			//2 get Verb Tense
			if (sentList != null && !sentList.isEmpty()){
				for(Sentence sent : sentList) {
					String verbTP ="";
					for ( WordToken wt : JCasUtil.selectCovered(jcasWordToken.classsent)) {
						if (wt != null){
							String pos = wt.getPartOfSpeech();
							if (pos.startsWith("VB")){
								verbTP = verbTP + "_" + pos;
					Feature feature = new Feature("VerbTenseFeature"verbTP);
					//"found nearby verb's pos tag: "+ verbTP);
					//check if the verb pattern is different from the old
					if(knowSentence == null && !verbTP.equals("")){
						knowSentence = sent;
						seenVbPattern = verbTP;
					}else if(knowSentence != null && knowSentence != sent && verbTP.equals(seenVbPattern)){
						feature = new Feature("TwoSentenceShareTheSameVerbPattern"verbTP);
		return feats;
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